Editing Reaction

{{Quality|Superior}}
{{av}}
{{Modding}}

'''Reactions''' are modular, editable formulas that take specific ingredients, or reagents, and use them to produce a desired item.  A lot of reactions are hardcoded—building beds or creating glass, for example—but a few are freely editable, and it's (sometimes) quite simple to add additional ones. There is a separate page with custom [[reaction examples]].

== Reaction differences between modes ==
{{migrated section}}

In [[fortress mode]], reactions are linked to specific buildings, and must be added to a civilization's [[entity token|entity file]] to be usable by that civilization. This has the useful effect of limiting new items and materials (such as special [[wood]] or [[metal]]) to civilizations that have the requisite reaction — so that if you give your custom civilization a reaction to produce "star metal" or some other custom material, only they will be able to use it.

In [[adventure mode]], reactions are freely available in the {{k|x}} menu via the {{DFtext|create}} option, and any adventurer character can make free use of them. Reagents may be held in the hands or dropped on the ground, but cannot be used within a backpack or quiver. There are several bugs with adventure mode reactions, chief of which is the fact that you cannot select liquid reagents.{{verify}} <!-- reaction product tag works now, liquids and improvement quality don't -->

== Anatomy of a reaction ==
Reactions are found within reaction_x files (such as reaction_smelter or reaction_other).  All reaction files must begin with the file name, followed by the <code>[OBJECT:REACTION]</code> token that tells the game that the file contains reaction definitions.

The reactions themselves generally adhere to the following structure:

   [REACTION:<identifier>]
      [NAME:<name>]
      [BUILDING:<BUILDING NAME>:<BUILDING KEY>]
      [REAGENT:A:150:BAR:NONE:POTASH:NONE]
      [PRODUCT:100:1:BAR:NONE:PEARLASH:NONE][PRODUCT_DIMENSION:150]
      [FUEL] 
      [SKILL:<SKILL TOKEN>]
      [MAX_MULTIPLIER:<multiplier>]
      [AUTOMATIC]
      [ADVENTURE_MODE_ENABLED]
      [DESCRIPTION:<description>]

* ''[[#Reaction identifier|identifier]]'': The internal ID of the reaction.
* ''[[#Reaction name|name]]'': The name of the reaction, visible to the player in the Fortress mode or Adventure mode menus.
* ''[[#Building|building]]'': The building ID that the reaction uses, and the relevant keyboard shortcut.
* ''[[#Reagents|...reagents...]]'': Zero or more reagents (ingredients) that are required to be in stock for the reaction to be possible.
* ''[[#Products|...products...]]'': Zero or more products that are created from the reaction.
* ''[[#Fuel|fuel]]'': (optional) If present, the reaction requires charcoal, coke or a magma-powered workshop.
* ''[[#Skill|skill]]'': (optional) The skill required and trained by the reaction.
* ''[[#Max multiplier|multiplier]]'': (optional) If present, the reaction will only be done the specified number of times per job; used to limit the output of reactions that accept stacks of items as reagents.
* ''[[#Automatic|automatic]]'': (optional) If present, the reaction will automatically be enqueued whenever it can possibly be performed.
* ''[[#Adventure mode enabled|adventure mode enabled]]'': (optional) If present, the reaction can be used by the player in Adventure mode.
* ''[[#Description|description]]'': (optional) If present, shows pop-up description when the reaction is selected in workshop (not working in v50).

=== Reaction identifier ===
The REACTION token assigns a unique ID to your reaction.
    [REACTION:<reaction identifier>]

The ''reaction identifier'' may be anything, so long as it is unique within the raw data files. A good habit to get into is to append a short prefix or suffix to each name related to the name of your mod, to ensure nobody else is going to make an identical reaction and thereby mess up the game if their mod is run alongside yours.  This is referenced in an entity definition via [[Entity_token#PERMITTED_REACTION|PERMITTED_REACTION]] to allow that entity to use the reaction.

=== Reaction name ===
The REACTION_NAME token assigns a descriptive name to your reaction in-game.
    [REACTION_NAME:<name>]

==== Name ====
This can be anything at all, and is how the reaction will appear in the job list of the building it is assigned to, and so should describe the reaction. '''Tan a hide''', for example, is the name of the default leather-producing reaction. Generally this should be written as a small descriptive verb phrase, with the first letter capitalized, for consistency with the existing reactions.

=== Building ===
The BUILDING token assigns the reaction to a building.  Adding multiple BUILDING tokens will cause the reaction to be available at all of the specified buildings.  Omitting the BUILDING token entirely will make the reaction unusable in Fortress mode (often used to restrict certain reactions to [[Reaction#Adventure_Mode_enabled|Adventure mode]]).

    [BUILDING:<building name>:<building key>]
* [[#Building name|''building name:'']] The ID of the building the reaction appears in.
* [[#Building key|''building key:'']] The hotkey to queue up the reaction in the specified building.

==== Building name ====
This is the ID of the building where the reaction will be carried out.  Valid building names are as follows:

* ASHERY - [[Ashery]]
* BOWYER - [[Bowyer's workshop]]
* CARPENTER - [[Carpenter's workshop]]
* CLOTHES - [[Clothier's shop]]
* CRAFTSMAN - [[Craftsdwarf's workshop]]
* FARMER - [[Farmer's workshop]]
* GLASS - [[Glass furnace]]
* KILN - [[Kiln]] and [[Magma kiln]]
* KITCHEN - [[Kitchen]]
* LEATHER - [[Leather works]]
* MASON - [[Stoneworker's workshop]]
* METALSMITH - [[Metalsmith's forge]]
* MILLSTONE - [[Millstone]]
* QUERN - [[Quern]]
* SIEGE - [[Siege workshop]]
* SMELTER - [[Smelter]] and [[Magma smelter]]
* STILL - [[Still]]
* TANNER - [[Tanner's shop]]
* WOOD - [[Wood furnace]]
* Any custom (raw-defined) building, such as:
** SOAP_MAKER - [[Soap maker's workshop]]
** SCREW_PRESS - [[Screw press]]

Custom reactions cannot be added to the following buildings:
* JEWELER - [[Jeweler's workshop]]

==== Building key ====
This defines the shortcut key(s) used to queue up the reaction in the workshop during gameplay in Classic mode only.  It can be NONE for no shortcut, or take the format of CUSTOM_X, where X can be: any uppercase letter, which shows as a lowercase letter in the building UI, eg. "CUSTOM_A" creates the shortcut {{k|a}}; or a valid modifier key (ALT, CTRL, or SHIFT) followed by an uppercase letter, eg. CUSTOM_SHIFT_A.

=== Category ===

Categories are custom submenus for buildings' reaction menus. A reaction doesn't require a category, but if you have a lot of reactions, categories can be invaluable for organizing and presenting those reactions to players.

Categories can be nested indefinitely—you can have a category within a category within a category within a category within a category within... but as a practical matter, nesting categories more than 2 deep is not recommended.

Categories will be displayed in alphabetical order, first off the file name and then off the category name.  

Categories currently have no effect on adventure mode reactions.

==== Defining a category ====

Each category needs to be defined within a reaction, usually one which should appear within its menu. Categories only need to be defined once.

{| {{prettytable}}
|- bgcolor="#dddddd"
! Token
! Arguments
! Description
|-
| CATEGORY || Category ID || The category ID is a unique identifier for the category. It is only used in the raws, and will not appear in the game.

If you're defining multiple categories within the same reaction - for example, if you intend the reaction to be nested two deep, and haven't yet defined the super-category - the ''last'' CATEGORY token within the reaction definition is the one that the reaction will appear in.
|-
| CATEGORY_NAME || String || The name of the category as displayed in-game.
|-
| CATEGORY_DESCRIPTION || String || Optional. If present, when the category is highlighted in a building menu, this string will be displayed in the Helpful Hint box.
|-
| CATEGORY_PARENT || Category ID || Optional. If present, this category will be a submenu of the indicated category, rather than a submenu of the reaction's building.
|-
| CATEGORY_KEY || Hotkey token || Optional. If present, this category can be selected from its parent menu (whether a building or a parent category) using the given hotkey.  Uses the same format as the BUILDING KEY described above.
|}

==== Adding reactions to an existing category ====

Just include the tag [CATEGORY:<category_id>] within your reaction definition, and if the category exists, your reaction will be added to its menu. You can only add reactions to custom categories.

Each reaction can belong to only one category.

=== Reagents ===

REAGENTs are a little bit complicated. They are the ingredients that the reaction will use.  You can define as many as you like within a reaction.

    [REAGENT:<name>:<quantity>:<item token>:<material token>][...modifiers...]
* ''[[#Reagent name|name]]'': The name of the reagent, local to the reaction.
* ''[[#Quantity|quantity]]'': The amount of the item that will be used in the reaction.
* ''[[#Item_token|item token]]'': The type (and subtype) of the item you require.
* ''[[#Material_token|material token]]'': The material the item should be made of.
* ''[[#Modifiers|...modifiers...]]'': Zero or more tokens which further clarify the acceptable types when the item type and material types are insufficient to distinguish them.

==== <span id="Reagent name">Name</span> ====

The name field is a small string used to identify the reagent within the reaction. The name is not visible to the player. It is local to the reaction and does not need to be unique across all of the reactions, so you can reuse the same names over and over, although each reagent within the same individual reaction must have a different name.

Most reagents are simply named '''A''', '''B''', and so forth in default reactions, although names such as '''TOOLSTONE''', '''FLUX''', or '''seeds''' will also work equally well. The PRODUCT may make reference to this name &ndash; for instance, if a container '''B''' is specified as a reagent, PRODUCT_TO_CONTAINER:B specifies that container.

==== Quantity ====

How many or how much of this reagent the reaction requires.  For most item types this is just the number of them required.  However, some other item types─specifically bars, cloth, thread, globs, liquids, powder, and sheets of paper or parchment─instead use numbers representing the size of the material within one (or more) of these items. For example, while REAGENT:A:'''''10''''':'''''TOY''''':NONE:NONE:NONE is ten unique, solid toy items, REAGENT:A:'''''10''''':'''''THREAD''''':NONE:NONE:NONE is an extremely tiny portion of a random spool of thread. One can see which items have what size quantities in the description of the [[Reaction#PRODUCT_DIMENSION|PRODUCT_DIMENSION]] token.

If one of the reagents is in a stack, or the reaction is only using a fraction of the amount of a sized item, the reaction will consume the entire stack, or as much of the sized item as possible, and multiply the product accordingly.  This behaviour can be controlled using the [[Reaction#MAX_MULTIPLIER|MAX_MULTIPLIER]] token.

==== Item token ====

[[Item token]]s are of the form ITEM_TYPE:ITEM_SUBTYPE.

The ITEM_TYPE is the category of item you require; WEAPON, TOY or SKIN_TANNED, for example.

The ITEM_SUBTYPE is name of the exact item that you require. Examples are ITEM_WEAPON_SPEAR or ITEM_TOY_PUZZLEBOX. Some items, like quivers or backpacks, or chunks of stone or metal, have no subtype and only require the item token to be filled in; so if you're asking for those you should set the subtype to NONE. Subtypes are defined within the local raw data files and their exact names can be referenced by looking at the corresponding file.

For reagents, the item token can also be set to ANY_RAW_MATERIAL:NONE (to permit BAR, BOULDER, POWDER_MISC, or GLOB) or ANY_CRAFT:NONE (to permit FIGURINE, AMULET, SCEPTER, CROWN, RING, EARRING, or BRACELET). Internally, these special values are both converted to NONE:NONE and merely set special modifiers (similar to [BUILDMAT])—they cannot be used in any other context.

For backwards compatibility, reagents can also accept "METAL_ORE:metal_id" in place of both the item and material tokens—this is equivalent to using the reagent BOULDER:NONE:NONE:NONE with the modifier [METAL_ORE:metal_id] (see below).

==== Material token ====

[[Material token]]s come in several forms. For most reagents, this will typically be INORGANIC:MATERIAL_ID or NONE:NONE (to allow multiple materials using other modifier tokens).

Some reactions will allow the player to select specific materials after creating the job (or in [[Reaction#material_token_2|some cases]], armor size from the product), by clicking on the magnifying glass icon next to the job in the workshop queue.  To permit this behaviour in your reaction, the reagent materials must be specified as follows:
{| {{prettytable}}
|- bgcolor="#dddddd"
! Item Type
! Material
! Notes
|-
| style="vertical-align: top"| BAR<br>BLOCKS<br>BOULDER<br>ROUGH<br>SMALLGEM || style="vertical-align: top"| INORGANIC:NONE || style="vertical-align: top"| These all appear as "stone" in the material selection menu, and list all inorganic materials regardless of any material modifier tokens, eg. [ITEMS_METAL]. BAR and BLOCKS made of organic materials, and BOULDER made of clay, are excluded.
|-
| style="vertical-align: top"| SKIN_TANNED or WOOD || style="vertical-align: top"| NONE:NONE || 
|-
| style="vertical-align: top"| Other Item Types || style="vertical-align: top"| NONE:NONE || style="vertical-align: top"| These will appear if a material modifier token other than [ANY_LEATHER_MATERIAL] is included. 
|}

==== Modifiers ====

Reagents may also have extra tokens added on, following the REAGENT token, in order to modify their behaviour.

Generally speaking, if you set a field in a reagent to NONE, the reaction won't discriminate when it comes to that particular field. For example, if you require a BOULDER reagent but leave the material as NONE:NONE, it will grab any available BOULDER-type item regardless of material. Modifiers can then be used to restrict this to only certain broad classes of materials.

The following is a list of all known reagent modifiers:

{| {{prettytable}}
|- bgcolor="#dddddd"
! Token
! Arguments
! Description
|-
| style="vertical-align: top"| ANY_BONE_MATERIAL
|
| Reagent material must have the [BONE] token.
|-
| style="vertical-align: top"| ANY_GEM_MATERIAL
|
| Reagent material must have the [IS_GEM] token.
|-
| style="vertical-align: top"| ANY_HORN_MATERIAL
|
| Reagent material must have the [HORN] token.
|-
| style="vertical-align: top"| ANY_LEATHER_MATERIAL
|
| Reagent material must have the [LEATHER] token.
|-
| style="vertical-align: top"| ANY_PEARL_MATERIAL
|
| Reagent material must have the [PEARL] token.
|-
| style="vertical-align: top"| ANY_PLANT_MATERIAL
|
| Reagent material must be subordinate to a PLANT object.
|-
| style="vertical-align: top"| ANY_SHELL_MATERIAL
|
| Reagent material must have the [SHELL] token.
|-
| style="vertical-align: top"| ANY_SILK_MATERIAL
|
| Reagent material must have the [SILK] token.
|-
| style="vertical-align: top"| ANY_SOAP_MATERIAL
|
| Reagent material must have the [SOAP] token.
|-
| style="vertical-align: top"| ANY_STONE_MATERIAL
|
| Reagent material must have the [IS_STONE] token.
|-
| style="vertical-align: top"| ANY_STRAND_TISSUE
|
| Reagent is made of a tissue having TISSUE_SHAPE:STRANDS, intended for matching hair and wool. Must be used with USE_BODY_COMPONENT.
|-
| style="vertical-align: top"| ANY_TOOTH_MATERIAL
|
| Reagent material must have the [TOOTH] token.
|-
| style="vertical-align: top"| ANY_WOOD_MATERIAL
|
| Reagent material must have the [WOOD] token.
|-
| style="vertical-align: top"| ANY_YARN_MATERIAL
|
| Reagent material must have the [YARN] token.
|-
| style="vertical-align: top"| BUILDMAT
|
| Reagent must be a general [[building material]] - BAR, BLOCKS, BOULDER, or WOOD.
|-
| style="vertical-align: top"| CAN_USE_ARTIFACT
|
| Reagent can be an Artifact. Using [PRESERVE_REAGENT] with this is strongly advised.
|-
| style="vertical-align: top"| CONTAINS
| style="vertical-align: top"|
* [[#Reagent name|Reagent name]]
| Reagent is a container that holds the specified reagent (where ''Reagent name'' is the locally-defined name of the reagent).
|-
| style="vertical-align: top"| CONTAINS_LYE
|
| Reagent must be a BARREL or TOOL which contains at least one item of type LIQUID_MISC made of LYE. Use of this token is discouraged, as it does not work with buckets (instead, use [CONTAINS:lye] &mdash; note the colon &mdash; and a corresponding lye reagent [REAGENT:lye:150:LIQUID_MISC:NONE:LYE]).
|-
| style="vertical-align: top"| DOES_NOT_ABSORB
|
| Reagent material must have ABSORPTION:0
|-
| style="vertical-align: top"| DOES_NOT_DETERMINE_PRODUCT_AMOUNT
|
| Reagent quantity is ignored for the purposes of producing extra outputs. Typically used for containers so that [[stack]]s of reagents will correctly produce additional outputs.
|-
| style="vertical-align: top"| EMPTY
|
| If the reagent is a container, it must be empty.
|-
| style="vertical-align: top"| FIRE_BUILD_SAFE
|
| Reagent material must be solid and stable at temperatures approaching 11000. Only works with items of type BAR, BLOCKS, BOULDER, WOOD, and ANVIL - all others are considered unsafe.
|-
| style="vertical-align: top"| FOOD_STORAGE_CONTAINER
|
| Reagent is either a BARREL or a TOOL with the FOOD_STORAGE use.
|-
| style="vertical-align: top"| GLASS_MATERIAL
|
| Reagent material must have the IS_GLASS token. All 3 types of [[glass]] have this token hardcoded.
|-
| style="vertical-align: top"| HARD_ITEM_MATERIAL
|
| Reagent material must have the [ITEMS_HARD] token.
|-
| style="vertical-align: top"| HAS_EDGE
|
| Reagent must have an edge.
|-
| style="vertical-align: top"| HAS_ITEM_REACTION_PRODUCT
| style="vertical-align: top"|
* PRODUCT_ID
| Reagent material must have the item reaction product specified by PRODUCT_ID - [[Reaction#Item_reaction_products|see below]] for more details. This can be used interchangeably with HAS_MATERIAL_REACTION_PRODUCT.
|-
| style="vertical-align: top"| HAS_MATERIAL_REACTION_PRODUCT
| style="vertical-align: top"|
* PRODUCT_ID
| Reagent material must have the material reaction product specified by PRODUCT_ID - [[Reaction#Material_reaction_products|see below]] for more details.
|-
| style="vertical-align: top"| HAS_TOOL_USE
| style="vertical-align: top"|
* [[Tool token#TOOL_USE|TOOL_USE]] value
| Reagent must be a [[tool]] with the specific TOOL_USE value. The reagent's item type must be TOOL:NONE for this to make any sense.
|-
| style="vertical-align: top"| IS_CRAFTED_ARTIFACT{{verify}}
|
| Reagent item must be an artifact.
|-
| style="vertical-align: top"| IS_DIVINE_MATERIAL
|
| Reagent material must have the [DIVINE] token.
|-
| style="vertical-align: top"| IS_SAND_MATERIAL
|
| Reagent material must have the [SOIL_SAND] token.
|-
| style="vertical-align: top"| MAGMA_BUILD_SAFE
|
| Reagent material must be solid and stable at temperatures approaching 12000. Only works with items of type BAR, BLOCKS, BOULDER, WOOD, and ANVIL - all others are considered unsafe.
|-
| style="vertical-align: top"| METAL_ITEM_MATERIAL
|
| Reagent material must have the [ITEMS_METAL] token.
|-
| style="vertical-align: top"| METAL_ORE
| style="vertical-align: top"|
* Metal ID
| Reagent material must be an ore of the specified metal.
|-
| style="vertical-align: top"| MIN_DIMENSION
| style="vertical-align: top"|
* Integer
| Reagent's item size must be at least as large as ''Integer''. The reagent's item type must be BAR, POWDER_MISC, LIQUID_MISC, DRINK, THREAD, CLOTH, or GLOB for this to work.  See [[Reaction#PRODUCT_DIMENSION|PRODUCT_DIMENSION]] below.
|-
| style="vertical-align: top"| NO_EDGE_ALLOWED
|
| Reagent must not have an edge, so must be blunt. Sharp stones (produced using knapping) and most types of weapon/ammo can not be used with this token.
|-
| style="vertical-align: top"| NOT_ARTIFACT{{verify}}
|
| Reagent item must not be an artifact.
|-
| style="vertical-align: top"| NOT_CONTAIN_BARREL_ITEM
|
| If the reagent is a container, it must not contain [[lye]] or [[milk]]. Not necessary if specifying [EMPTY].
|-
| style="vertical-align: top"| NOT_ENGRAVED
|
| Reagent can not be engraved. For example, a memorial slab can not be engraved.
|-
| style="vertical-align: top"| NOT_IMPROVED
|
| Reagent has not been decorated.
|-
| style="vertical-align: top"| NOT_PRESSED
|
| Reagent must not be in the SOLID_PRESSED state.
|-
| style="vertical-align: top"| NOT_WEB
|
| Reagent must be collected (to distinguish silk thread from webs). Only makes sense for items of type THREAD.
|-
| style="vertical-align: top"| ON_GROUND
|
| Reagent must be on the ground. Grabs from stockpiles. Does not grab from inventories (workshops, wagon) and causes infinite gathering for reactions in workshop.
|-
| style="vertical-align: top"| POTASHABLE (Deprecated)
|
| Alias for [CONTAINS_LYE].
|-
| style="vertical-align: top"| PRESERVE_REAGENT
|
| Reagent is not destroyed, which is the normal effect, at the completion of the reaction. Typically used for containers.
|-
| style="vertical-align: top"| REACTION_CLASS
| style="vertical-align: top"|
* CLASS_ID
| Reagent material must have the reaction class specified by CLASS_ID - [[Reaction#Reaction_classes|see below]] for more details.
|-
| style="vertical-align: top"| UNROTTEN
|
| Reagent must not be rotten, mainly for organic materials.
|-
| style="vertical-align: top"| USE_BODY_COMPONENT
|
| Reagent must be a body part (CORPSE or CORPSEPIECE). Must be used even if your reagent item type is CORPSE or CORPSEPIECE, otherwise it will match any item.
|-
| style="vertical-align: top"| WEB_ONLY
|
| Reagent must be undisturbed (to distinguish silk thread from webs). Only makes sense for items of type THREAD.
|-
| style="vertical-align: top"| WORTHLESS_STONE_ONLY
|
| Reagent material must be non-[[economic]].
|-
| style="vertical-align: top"| WOVEN_ITEM
|
| Reagent must be a clothing item made of a woven material, ie. plant, silk, or yarn cloth.
|}

=== Products ===

Products are the end product of the reaction. A reaction can have as many products as it likes.

Products are almost identical to reagents, except that they do not need to be named, can't have fields undefined, and don't use the quantity field to determine the product size. Instead, the token [PRODUCT_DIMENSION:X] is tacked on after the PRODUCT token, determining the size of the product.

Products can be produced directly to a container using the [PRODUCT_TO_CONTAINER:''name''] token, where the ''name'' is the [[#Reagent name|name]] of a reagent. This requires the reagent to have the [PRESERVE_REAGENT] token.

Restating this in the above style, we have:
   [PRODUCT:<probability>:<quantity>:<item token>:<material token>][...modifiers...]

==== Probability ====

The percentage chance the product will be produced when the reaction is completed. Must be an integer.

==== Quantity ====

Determines how many of the product will be produced. For the item types AMMO, REMAINS, MEAT, FISH, FISH_RAW, PLANT, PLANT_GROWTH, DRINK, CHEESE, LIQUID_MISC, COIN, and EGG, the resulting items will be created as a single [[stack]], while all other item types will produce multiple individual items.

If a reaction can take stacks of input items, then it will attempt to perform the reaction enough times to consume as many full sets of reagents as it can—for example, if a reaction "1 piece of meat + 2 pieces of fish -> 3 pieces of cheese" is given a stack of 5 meat and 5 fish, it will produce 6 pieces of cheese and leave 3 meat and 1 fish behind. Using the token DOES_NOT_DETERMINE_PRODUCT_AMOUNT allows a reagent to be excluded from this calculation - for example, with the reaction "1 plant + 1 barrel -> 5 alcohol (into barrel)", using this on the barrel allows the reaction to be performed as "5 plant + 1 barrel -> 25 alcohol" instead of "5 plant + 5 barrel -> 25 alcohol".

==== Item token ====

The [[item token]] and subtype of the item you produce.

If your item has an [[Reaction#Item reaction products|item reaction product]] and you want the item type and material to be derived from one of the reagents, you can use GET_ITEM_DATA_FROM_REAGENT:reagent:REACTION_PRODUCT_ID in place of both the item token ''and'' the material token (see next section). You can also specify GET_ITEM_DATA_FROM_REAGENT:reagent:NONE in order to make a direct copy of the source item, though this will not work for complex items such as corpses or prepared meals.

For products, this can also be set to CRAFTS:NONE to produce up to three random [[craft]] items. This value cannot be used in any other context.

==== Material token ====

A [[material token]] describing what the product will be made of.

If you want the product's material to be derived from one of the reagents, and the reagent has a [[Reaction#Material_reaction_products|material reaction product]] defined, you can use GET_MATERIAL_FROM_REAGENT:reagent:REACTION_PRODUCT_ID in place of the material token. You can also specify GET_MATERIAL_FROM_REAGENT:reagent:NONE in order to directly use the reagent's own material.

Similarly to choosing material types for a reagent, if the item product is armor/clothing, and has the appropriate [[Entity_token#Available_resources|armor token]] in the entity file, you will be able to choose the armor/clothing size for different creatures by clicking the magnifying glass of the workshop task. However, this will only work if the product material is [[Modding pitfalls#My_custom_armor.2Fclothing_reaction_won.27t_let_user_choose_size|cloth leather or certain metals]], and the item is also recognized by the related vanilla workshop reaction{{verify}}.

==== Product modifiers ====

Zero or more tokens which further set the properties or disposition of the resulting product item.

{| {{prettytable}}
|- bgcolor="#dddddd"
! Token
! Arguments
! Description
|-
| style="vertical-align: top"| FORCE_EDGE
|
| Product is given a sharp edge. Used for knapping.
|-
| style="vertical-align: top"| PRODUCT_PASTE
|
| Product is created in the SOLID_PASTE state.
|-
| style="vertical-align: top"| PRODUCT_PRESSED
|
| Product is created in the SOLID_PRESSED state.
|-
| style="vertical-align: top"| PRODUCT_DIMENSION
| style="vertical-align: top"|
* Integer
| Specifies the dimension of the product for those items that use dimensions. For items of type BAR, DRINK, GLOB, LIQUID_MISC, and POWDER_MISC, one item is dimension 150; one item of CLOTH or SHEET is dimension 10000; and one item of THREAD is dimension 15000. Has no effect on any other item types. Note: this is not the actual [[storage]] volume of the product, which is hard-coded by the item token. 
|-
| style="vertical-align: top"| PRODUCT_TO_CONTAINER
| style="vertical-align: top"|
* [[#Reagent name|Name]]
| Places the product in a container; ''Name'' must be the name of a reagent with the [PRESERVE_REAGENT] token and a container item type.
|-
| style="vertical-align: top"| PRODUCT_TOKEN
| style="vertical-align: top"| 
* [[#Reagent name|Name]]
| Allows the product to be referred to by the given name for the purpose of being passed down as and argument in other tokens, in the same fashion as reagent names.
|-
| style="vertical-align: top"| TRANSFER_ARTIFACT_STATUS
| 
| style="vertical-align: top"| Transfers artifact status from the reagent to the product.
|}

=== Improvements ===

Improvements are applied to existing reagents. A reaction can have as many improvements as it likes.

Restating this in the above style, we have:
   [IMPROVEMENT:<probability>:<reagent name>:<improvement type>:<material token>]

==== Probability ====
The percentage chance the improvement will be applied to the reagent when the reaction is completed.

==== Reagent name ====
The [[#Reagent name|name]] of the reagent that will be improved. In order to be meaningful, this reagent must have [PRESERVE_REAGENT].

==== Improvement type ====
The following improvement types can be used:

{| {{prettytable}}
|- bgcolor="#dddddd"
! Token
! Description
|-
| COVERED
| Item is encrusted/studded/decorated with <material>.
|-
| GLAZED
| Item is glazed with <material>.
|-
| RINGS_HANGING
| Item is adorned with hanging rings of <material>.
|-
| BANDS
| Item is encircled with bands of <material>.
|-
| SPIKES
| Item menaces with spikes of <material>.
|-
| PAGES
| Adds pages to a [[book]].
|-
| SPECIFIC
| With subtype ROLLERS, adds rollers of <material> to a [[scroll]]; with subtype HANDLE, adds a handle of <material> to an item; with subtype TRACTION_BENCH_CHAIN or TRACTION_BENCH_ROPE adds a chain or rope of <material> to an item.
|}

All other item improvement tokens (ART_IMAGE, ITEMSPECIFIC, THREAD, CLOTH, SEWN_IMAGE, and ILLUSTRATION) are ignored.

==== Material token ====

A [[material token]] describing what the decoration will be made of.

If you want the product's material to be derived from one of the reagents, and the reagent has a [[Reaction#Material_reaction_products|material reaction product]] defined, you can use GET_MATERIAL_FROM_REAGENT:reagent:REACTION_PRODUCT_ID in place of the material token. You can also specify GET_MATERIAL_FROM_REAGENT:reagent:NONE in order to directly use the reagent's own material.

=== Other tokens ===

==== Fuel ====

The FUEL token means that the reaction requires coke or charcoal to be performed. Fuel is not needed when the reaction is performed at a magma workshop (a [[magma kiln]], [[magma smelter]], or any custom building having [NEEDS_MAGMA]).

==== Skill ====

The [[Skill token|skill tokens]] determine what skill the reaction requires and trains; also how quickly skill is gained, how quickly those skill gains raise attributes, and how skill level affects the quality of the reaction product.

{| {{prettytable}}
|- bgcolor="#dddddd"
! Token
! Arguments
! Description
|-
| style="vertical-align: top"| SKILL
| style="vertical-align: top"| 
* [[Skill token]] 
| (Optional) This identifies the skill required to carry out the reaction and is trained when the reaction is performed.  Only one skill may be specified; if multiple skill tokens are defined only the last will be used.  A reaction with no product will yield no experience gain.  A reaction with no SKILL token will complete in a default amount of time.
|-
| style="vertical-align: top"| SKILL_IP
| style="vertical-align: top"|
* Integer
| (Optional, requires SKILL token)  This adjusts the amount of skill gained each time the reaction is carried out.  The default value is 30; higher values increase the amount of skill gain.
|-
| style="vertical-align: top"| ATTRIBUTE_IP
| style="vertical-align: top"|
* Integer
| (Optional, requires SKILL token)  This adjusts the amount of [[Attribute|attribute]] gain that skill gain from this reaction results in.  The default value is 10; higher values increase the amount of attribute gain.
|-
| style="vertical-align: top"| SKILL_ROLL_RANGE
| style="vertical-align: top"|
* Range
* Multiplier
| (Optional, requires SKILL token)  This changes how much skill level affects the quality of the reaction product.  The default is [SKILL_ROLL_RANGE:11:5]. The ''range'' is the base "die roll" and the ''multiplier'' determines how much the dwarf's skill can affect the reaction; the skill roll is random(range) + random((skill level * multipler)/2 + 1) + random((skill level * multipler)/2 + 1), where random(x) gives a random number from 0 to x-1, inclusive (which also means that the minimum for the range is 1). The higher result on the roll, the better. Both numbers can be lowered to make the skill check harder. For example, with the default values a dwarf who is proficient in a skill has a skill level of 5; their roll will be random(11)+random(13)+random(13), meaning this dwarf can roll anywhere from 0 to 34; similarly, unskilled dwarves can roll 0 to 10 while legendary+0 (skill 15) dwarves can roll 0 to 84. If this is changed to [SKILL_ROLL_RANGE:1:8], then instead a proficient dwarf will have random(1)+random(21)+random(21), giving a roll of 0 to 40, with unskilled dwarves always rolling 0 and legendary dwarves going all the way up to 120.

As a consequence, increasing the multiplier will always make legendary dwarves more effective, even if base roll is reduced to its minimum of 1, with the default going up to 84 for default and 90 for [SKILL_ROLL_RANGE:1:6].
|}

==== Max multiplier ====

The [MAX_MULTIPLIER:<#>] token specifies how many times to do the reaction. This can be used to limit stacked reagent use to the specified quantity instead of the whole stack.

==== Automatic ====

The AUTOMATIC token means that the reaction will be queued automatically if the reaction reagents are all present.

This token only works with jobs performed at a [[kiln]], [[smelter]], [[tanner's shop]], [[kitchen]], or custom workshop, and [[standing orders]] allow you to limit which ones trigger; custom reactions performed at a [[quern]], [[millstone]]{{verify}}, [[still]]{{verify}} or [[craftsdwarf's workshop]]{{verify}} cannot be made automatic.

==== Adventure mode enabled ====

The ADVENTURE_MODE_ENABLED token means that this version of the reaction can be used by the wanderers of Adventure Mode without needing to also give the dwarves at home in a fortress access to it.  When using this token, it will be allowed for adventurers of any race, without editing entity files. This token does not prevent Fortress Mode usage assuming the reaction also has a usable building assigned and is a {{token|PERMITTED_REACTION|entity}} within the entity file.

==== Description ====

This feature is exclusive to Classic Mode, as no description window pops up when mousing over reactions in workshops in Premium.

The [DESCRIPTION:<string>] token provides a text description of the reaction when it is highlighted in the building UI.  Multiple DESCRIPTION tokens can be defined in a reaction, and each will appear on a new line.  The pop-up box that contains the description is limited to 325 characters total.  Alternatively, this token can reference a DESCRIPTION token in an existing tool definition by replacing ''string'' with USE_TOOL:<ITEM_SUBTYPE>; or an existing instrument definition with USE_INSTRUMENT:<ITEM_SUBTYPE>.

== Reaction classes and products ==

When you're doing things like tanning hides or brewing alcohol, having separate reactions for every single possible raw material is unwieldy and terrible. However, you can let the reaction itself ask the material for details and process them all with the same reaction. There are three types of tags to dictate this behavior.

=== Reaction classes ===

The simplest token is the reaction class. If it is tacked on a material, a reaction can limit reagents to only those materials that have the specified arbitrary [REACTION_CLASS:whatever] identifier.

We want a reaction that smelts iron and flux into pig iron. However, there are a half-dozen different stones that count as flux. Instead of clogging up the smelter job menu with six nearly identical reactions that all take in either dolomite or limestone or marble for the same result, we use a reaction class.

   [REACTION:PIG_IRON_MAKING]
      [NAME:make pig iron bars]
      [BUILDING:SMELTER:NONE]
      [REAGENT:A:150:BAR:NO_SUBTYPE:METAL:IRON]
      [REAGENT:B:1:BOULDER:NO_SUBTYPE:NONE:NONE]'''[REACTION_CLASS:FLUX]'''
      [REAGENT:C:150:BAR:NO_SUBTYPE:COAL:NO_MATGLOSS]
      [PRODUCT:100:1:BAR:NO_SUBTYPE:METAL:PIG_IRON][PRODUCT_DIMENSION:150]
      [FUEL]
      [SKILL:SMELT]

Note how reagent B asks for "NONE:NONE" as its material. This means "boulders of any kind as long as they have the reaction class named FLUX". Stuff like calcite, here:

   [INORGANIC:CALCITE]
      [USE_MATERIAL_TEMPLATE:STONE_TEMPLATE]
      [STATE_NAME_ADJ:ALL_SOLID:calcite][DISPLAY_COLOR:7:7:1][TILE:'"']
      '''[REACTION_CLASS:FLUX]'''
      [ENVIRONMENT_SPEC:LIMESTONE:CLUSTER_SMALL:100]
      [ENVIRONMENT_SPEC:MARBLE:CLUSTER_SMALL:100]
      [MATERIAL_VALUE:2]
      [IS_STONE]
      [MELTING_POINT:12902]
      [SOLID_DENSITY:2930]

The label itself can be absolutely anything. It's only used to find a match between the material and the reaction. Note that some reaction classes have special meanings to the game itself—notably, the [[site finder]] knows that "FLUX" should be connected to the "Flux stone" filter.

=== Material reaction products ===

But what if it's not all the same what materials the members of the reaction class put out? If a tanner starts working on a bear pelt, a horse hide, some dragon scales and a section of human skin, surely they all can't produce generic boot leather! No, the reaction must get the chance to ask the "reaction class" what the reagent should turn out as. We will declare a material reaction product.

   [REACTION:TAN_A_HIDE]
      [NAME:tan a hide]
      [BUILDING:TANNER:CUSTOM_T]
         [REAGENT:flaps of skin:1:NONE:NONE:NONE:NONE][USE_BODY_COMPONENT][UNROTTEN]
            '''[HAS_MATERIAL_REACTION_PRODUCT:TAN_MAT]'''
         [PRODUCT:100:1:SKIN_TANNED:NONE:'''GET_MATERIAL_FROM_REAGENT:flaps of skin:TAN_MAT''']
      [SKILL:TANNER]
      [AUTOMATIC]

Where you'd usually have some fresh bodypart with the TAN_MAT reaction class produce some generic SKIN_TANNED, this goes further. Instead of declaring a material, the spool of pattern-ready tailoring leather (SKIN_TANNED) now comes out as whatever the skin flaps' material reaction product (named TAN_MAT) says in the material's definition (GET_MATERIAL_FROM_REAGENT). And what does it say?

   [MATERIAL_TEMPLATE:SKIN_TEMPLATE]
         [STATE_COLOR:ALL_SOLID:GRAY]
         [STATE_NAME:ALL_SOLID:skin]
         [STATE_ADJ:ALL_SOLID:skin]
         ...
         [ABSORPTION:100]
         '''[MATERIAL_REACTION_PRODUCT:TAN_MAT:LOCAL_CREATURE_MAT:LEATHER]'''
         [IMPLIES_ANIMAL_KILL]
         [ROTS]

It says that the caller of the TAN_MAT hook always comes out as the LEATHER of whatever creature the skin has been peeled off of (LOCAL_CREATURE_MAT). For example, skin taken from a butchered dog would be turned into dog leather. Change the SKIN_TEMPLATE MATERIAL_REACTION_PRODUCT to TAN_MAT:INORGANIC:GOLD instead and your tanner turns into Midas.  Use your imagination.

If the item you're creating should be made of the ''same'' material as the raw material you're using (e.g. if you're carving a log into a training spear), you can specify "NONE" instead of the MATERIAL_REACTION_PRODUCT code:

   [REACTION:MAKE WOODEN TRAINING SPEAR]
      [NAME:make wooden training spear]
      [BUILDING:CARPENTER:NONE]
      [REAGENT:log:1:WOOD:NONE:NONE:NONE][ANY_PLANT_MATERIAL]
      [PRODUCT:100:1:WEAPON:ITEM_WEAPON_SPEAR_TRAINING:'''GET_MATERIAL_FROM_REAGENT:log:NONE''']
      [SKILL:CARPENTRY]

As with reaction classes, some MATERIAL_REACTION_PRODUCT identifiers have special meanings to the game itself - notably, the [[site finder]] knows that "FIRED_MAT" should be connected to the "Clay" filter, and "CHEESE_MAT" is used when making [[cheese]] from [[milk]].

=== Item reaction products ===

Item reaction products are an even more powerful form of the above. Where material reaction products can only affect what type of stuff the predestined end product is made of, item reaction products can decide the entire end result ahead of time. Item AND material.

Let's assume for a moment that we're completely tired of leather earrings and hair crowns. We want a crafting reaction that takes cloth and only produces things that make sense.

      [REACTION:TAILOR_THE_BEST_THING]
            [NAME:weave something that makes sense]
            [BUILDING:CRAFTSMAN]
            [REAGENT:woven fabric:1:CLOTH:NONE:NONE:NONE]
               '''[HAS_ITEM_REACTION_PRODUCT:BEST_OPTION]'''
            [PRODUCT:100:1:'''GET_ITEM_DATA_FROM_REAGENT:woven fabric:BEST_OPTION''']
            [SKILL:CLOTHIER]

Now we need to come up with the counterpart tags in the materials. Hmmm... cotton is thin and soft, so it makes pretty good undergarments. An undershirt, maybe?

         [PLANT:COTTON] Gossypium hirsutum / sp.
                  [NAME:cotton plant][NAME_PLURAL:cotton plants][ADJ:cotton plant]
                  [USE_MATERIAL_TEMPLATE:STRUCTURAL:STRUCTURAL_PLANT_TEMPLATE]
                  [BASIC_MAT:LOCAL_PLANT_MAT:STRUCTURAL]
                  [DRY][BIOME:ANY_TROPICAL]
                  [VALUE:2]
                  ...
                  [USE_MATERIAL_TEMPLATE:THREAD:THREAD_PLANT_TEMPLATE]
                     [MATERIAL_VALUE:2]
                     '''[ITEM_REACTION_PRODUCT:BEST_OPTION:ARMOR:ITEM_ARMOR_TUNIC:LOCAL_PLANT_MAT:THREAD]'''
                  ...

Then jute fabric. Isn't that burlap? And what's about the only thing they make from burlap?

         [PLANT:JUTE] Corchorus capsularis / Corchorus olitorius
                  [NAME:jute plant][NAME_PLURAL:jute plants][ADJ:jute plant]
                  [USE_MATERIAL_TEMPLATE:STRUCTURAL:STRUCTURAL_PLANT_TEMPLATE]
                  [BASIC_MAT:LOCAL_PLANT_MAT:STRUCTURAL]
                  [DRY][BIOME:ANY_TROPICAL]
                  [VALUE:2]
                  ...
                  [USE_MATERIAL_TEMPLATE:THREAD:THREAD_PLANT_TEMPLATE]
                     [MATERIAL_VALUE:2]
                     '''[ITEM_REACTION_PRODUCT:BEST_OPTION:BAG:NONE:LOCAL_PLANT_MAT:THREAD]'''
                  ...

Sacks, of course! Wait, how about silk?

         [CREATURE:SPIDER_CAVE]
                  [DESCRIPTION:A tiny underground bug, sought after for its thread.]
                  [NAME:cave spider:cave spiders:cave spider]
                  ...
                  [USE_MATERIAL_TEMPLATE:SILK:SILK_TEMPLATE]
                     '''[ITEM_REACTION_PRODUCT:BEST_OPTION:PANTS:ITEM_PANTS_THONG:LOCAL_CREATURE_MAT:SILK]'''
                  ...

This goes on for as long as you let it. The ITEM_REACTION_PRODUCT declares the identifier and then the item and material with subtypes, just like a normal reaction's product line would.

Do note that MATERIAL_REACTION_PRODUCT and ITEM_REACTION_PRODUCT use the same IDs, so you cannot have both a material and item reaction product of the same name. Also, though you cannot use GET_ITEM_DATA_FROM_REAGENT with a MATERIAL_REACTION_PRODUCT (there'd be no item type information), you ''can'' use GET_MATERIAL_FROM_REAGENT on an ITEM_REACTION_PRODUCT (in case you want to force your own item type).

== Reactions and world generation ==

There are several things to keep in mind when you're adding reactions to a game that already exists.

* Most entity changes require a regen, but adding PERMITTED_REACTION tokens for reactions that existed at the time of world generation to the entity file in the save directory do not.
* Adding reactions to the raws in a save directory requires you to regen the world.
* You can alter an existing reaction in any way you like without regenning the world, so long as you don't alter the reaction identifier.

== Full token list ==

For the sake of convenience and readability, this is a complete compilation of the previously listed reaction tokens in alphabetical order:

{| {{prettytable}}
|- bgcolor="#dddddd"
! Token
! Arguments
! Type
! Description

|-
| style="vertical-align: top"| {{text anchor|ADVENTURE_MODE_ENABLED}}
|
|
| style="vertical-align: top"| This version of the reaction can be used by the wanderers of Adventure Mode without needing to also give the dwarves at home in a fortress access to it.  When using this token, it will be allowed for adventurers of any race, without editing entity files. This token does not prevent Fortress Mode usage.

|-
| style="vertical-align: top"| {{text anchor|ANY_BONE_MATERIAL}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent material must have the [BONE] token.

|-
| style="vertical-align: top"| {{text anchor|ANY_GEM_MATERIAL}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent material must have the [IS_GEM] token.

|-
| style="vertical-align: top"| {{text anchor|ANY_HORN_MATERIAL}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent material must have the [HORN] token.

|-
| style="vertical-align: top"| {{text anchor|ANY_LEATHER_MATERIAL}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent material must have the [LEATHER] token.

|-
| style="vertical-align: top"| {{text anchor|ANY_PEARL_MATERIAL}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent material must have the [PEARL] token.

|-
| style="vertical-align: top"| {{text anchor|ANY_PLANT_MATERIAL}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent material must be subordinate to a PLANT object.

|-
| style="vertical-align: top"| {{text anchor|ANY_SHELL_MATERIAL}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent material must have the [SHELL] token.

|-
| style="vertical-align: top"| {{text anchor|ANY_SILK_MATERIAL}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent material must have the [SILK] token.

|-
| style="vertical-align: top"| {{text anchor|ANY_SOAP_MATERIAL}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent material must have the [SOAP] token.

|-
| style="vertical-align: top"| {{text anchor|ANY_STONE_MATERIAL}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent material must have the [IS_STONE] token.

|-
| style="vertical-align: top"| {{text anchor|ANY_STRAND_TISSUE}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent is made of a tissue having [TISSUE_SHAPE:STRANDS], intended for matching hair and wool. Must be used with [USE_BODY_COMPONENT].

|-
| style="vertical-align: top"| {{text anchor|ANY_TOOTH_MATERIAL}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent material must have the [TOOTH] token.

|-
| style="vertical-align: top"| {{text anchor|ANY_WOOD_MATERIAL}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent material must have the [WOOD] token.

|-
| style="vertical-align: top"| {{text anchor|ANY_YARN_MATERIAL}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent material must have the [YARN] token.

|-
| style="vertical-align: top"| {{text anchor|ATTRIBUTE_IP}}
| style="vertical-align: top"| 
* Integer
| style="vertical-align: top"| Skill modifier
| style="vertical-align: top"| Amount of attribute gain given per skill improvement. Default is 10.

|-
| style="vertical-align: top"| {{text anchor|AUTOMATIC}}
|
|
| style="vertical-align: top"| The reaction will be queued automatically if the reaction reagents are all present.

|-
| style="vertical-align: top"| {{text anchor|BAG}} (Deprecated)
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent has to be a bag. Intended to be used with an item type of BOX, to prevent chests, coffers, and other containers from being used instead. Deprecated as of Version 0.50.01 in favor of BAG:NONE [[item token]].

|-
| style="vertical-align: top"| {{text anchor|BUILDING}}
| style="vertical-align: top"| 
* [[#building name|Building name]]
* [[#building key|In-building reaction hotkey]]
|
| style="vertical-align: top"| Sets the building that the reaction will be performed in, and the button used to queue the reaction once that building's menu is accessed in-game.

|-
| style="vertical-align: top"| {{text anchor|BUILDMAT}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent is able to be used to build structures (Boulders, Wood, Blocks, Bars).

|-
| style="vertical-align: top"| {{text anchor|CAN_USE_ARTIFACT}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent can be an Artifact.  Using [PRESERVE_REAGENT] with this is strongly advised.

|-
| style="vertical-align: top"| {{text anchor|CAN_USE_HOSPITAL_RESERVED}}
| 
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Allows the reagent to be an item that is otherwise reserved for use by a [[healthcare|hospital]].

|-
| style="vertical-align: top"| {{text anchor|CAN_USE_LOCATION_RESERVED}}
| 
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Allows the reagent to be an item that is otherwise reserved for use by a [[locations|location]].

|-
| style="vertical-align: top"| {{text anchor|CATEGORY}}
| style="vertical-align: top"| 
* Category ID 
|
| style="vertical-align: top"| Puts the reaction in a category. Categories are custom submenus for reaction menus. The category ID is a unique identifier for the category. It is only used in the raws, and will not appear in the game.

If you're defining multiple categories within the same reaction - for example, if you intend the reaction to be nested two deep, and haven't yet defined the super-category - the ''last'' CATEGORY token within the reaction definition is the one that the reaction will appear in.

|-
| style="vertical-align: top"| {{text anchor|CATEGORY_NAME}}
| style="vertical-align: top"| 
* String 
| style="vertical-align: top"| Category
| style="vertical-align: top"| The name of the category as displayed in-game.

|-
| style="vertical-align: top"| {{text anchor|CATEGORY_DESCRIPTION}}
| style="vertical-align: top"| 
* String 
| style="vertical-align: top"| Category
| style="vertical-align: top"| If present, when the category is highlighted in a building menu, this string will be displayed in the Helpful Hint box.

|-
| style="vertical-align: top"| {{text anchor|CATEGORY_PARENT}}
| style="vertical-align: top"| 
* Category ID 
| style="vertical-align: top"| Category
| style="vertical-align: top"| If present, this category will be a submenu of the indicated category, rather than a submenu of the reaction's building.

|-
| style="vertical-align: top"| {{text anchor|CATEGORY_KEY}}
| style="vertical-align: top"| 
* Hotkey
| style="vertical-align: top"| Category
| style="vertical-align: top"| If present, this category can be selected from its parent menu (whether a building or a parent category) using the given hotkey while playing in Classic mode.

|-
| style="vertical-align: top"| {{text anchor|CONTAINS}}
| style="vertical-align: top"| 
* [[#Reagent name|Reagent name]]
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent is a container that holds the specified reagent.

|-
| style="vertical-align: top"| {{text anchor|CONTAINS_LYE}} (Deprecated)
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| If the reagent is a container, it must contain LYE. No longer used - instead, use one reagent for the LYE itself and another reagent with [CONTAINS:lye_reagent].

|-
| style="vertical-align: top"| {{text anchor|DESCRIPTION}}
| style="vertical-align: top"| 
* String
|
| style="vertical-align: top"| A description of the reaction that appears when it is highlighted in the building UI.  ''String'' can also be replaced with a reference to existing DESCRIPTION tokens in tools (using USE_TOOL:<tool_id>) or musical instruments (using USE_TOOL:<instrument_id>).

|-
| style="vertical-align: top"| {{text anchor|DOES_NOT_ABSORB}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent material must have [ABSORPTION:0].

|-
| style="vertical-align: top"| {{text anchor|DOES_NOT_DETERMINE_PRODUCT_AMOUNT}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Performing a reaction with large [[stack]]s of inputs can allow multiple sets of outputs to be produced. Setting this flag causes the reagent to be ignored in this process - for example, with the reaction "1 plant + 1 barrel -> 5 alcohol (into barrel)", using this on the barrel allows the reaction to be performed as "5 plant + 1 barrel -> 25 alcohol" instead of "5 plant + 5 barrel -> 25 alcohol".

|-
| style="vertical-align: top"| {{text anchor|EMPTY}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| If the reagent is a container, it must be empty.

|-
| style="vertical-align: top"| {{text anchor|FIRE_BUILD_SAFE}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent must be considered [[fire-safe]] (stable [[temperature]] below {{ct|11000}}) - i.e. not wood, and not coal.

|-
| style="vertical-align: top"| {{text anchor|FORCE_EDGE}}
|
| style="vertical-align: top"| Product modifier
| style="vertical-align: top"| Product is given a sharp edge. Used for knapping.

|-
| style="vertical-align: top"| {{text anchor|FOOD_STORAGE_CONTAINER}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent must be a barrel or any non-absorbing tool with [TOOL_USE:FOOD_STORAGE].

|-
| style="vertical-align: top"| {{text anchor|FUEL}}
|
|
| style="vertical-align: top"| Requires that the reaction either use up a unit of coal or charcoal or else be performed at a magma workshop.

|-
| style="vertical-align: top"| {{text anchor|GLASS_MATERIAL}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent material has [IS_GLASS].

|-
| style="vertical-align: top"| {{text anchor|HAS_EDGE}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent must be sharpened (used for carving).

|-
| style="vertical-align: top"| {{text anchor|HAS_ITEM_REACTION_PRODUCT}}
| style="vertical-align: top"| 
* PRODUCT_ID (custom)
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Similar to HAS_MATERIAL_REACTION_PRODUCT, but requires the reagents material to have a matching ITEM_REACTION_PRODUCT entry.

|-
| style="vertical-align: top"| {{text anchor|HAS_MATERIAL_REACTION_PRODUCT}}
| style="vertical-align: top"| 
* PRODUCT_ID (custom)
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Similar to REACTION_CLASS, but requires the reagents material to have a matching [[Material definition token|MATERIAL_REACTION_PRODUCT]] entry. Intended for reactions which transform one class of material into another, such as skin->leather and fat->tallow.

|-
| style="vertical-align: top"| {{text anchor|HAS_TOOL_USE}}
| style="vertical-align: top"| 
* [[Tool token#TOOL_USE|TOOL_USE value]]
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent must be a [[tool]] with the specific TOOL_USE value. The reagents item type must be TOOL:NONE for this to make any sense.

|-
| style="vertical-align: top"| {{text anchor|HAS_WRITING_IMPROVEMENT}}
| 
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent must contain writing.

|-
| style="vertical-align: top"| {{text anchor|IMPROVEMENT}}
| style="vertical-align: top"| 
* Probability
* [[#Reagent name|Reagent name]]
* Improvement type
* Material Token
|
| style="vertical-align: top"| Applies an improvement to the named reagent.  Only meaningful if said reagent has [PRESERVE_REAGENT]. Improvement types include BANDS, COVERED, GLAZED, PAGES, RINGS_HANGING, and SPIKES

|-
| style="vertical-align: top"| {{text anchor|IS_CRAFTED_ARTIFACT}}{{verify}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent item must be an artifact.

|-
| style="vertical-align: top"| {{text anchor|IS_DIVINE_MATERIAL}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent material must have the [DIVINE] token.

|-
| style="vertical-align: top"| {{text anchor|MAGMA_BUILD_SAFE}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Currently broken - Reagent must be considered [[magma-safe]] (stable [[temperature]] below {{ct|12000}}).

|-
| style="vertical-align: top"| {{text anchor|MAX_MULTIPLIER}}
| style="vertical-align: top"| 
* Integer
|
| style="vertical-align: top"| Sets the maximum number of times a reaction is allowed to run when using stacked reagents. This can be used to ensure that the reaction doesn't repeat until the entire stack is depleted.

|-
| style="vertical-align: top"| {{text anchor|METAL_ORE}}
| style="vertical-align: top"| 
* Inorganic material
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent material must be an ore of the specified metal.

|-
| style="vertical-align: top"| {{text anchor|MIN_DIMENSION}}
| style="vertical-align: top"| 
* Integer
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Requires that the reagent have a size of at least ''integer''. Only effective with BAR, POWDER_MISC, LIQUID_MISC, DRINK, THREAD, CLOTH, and GLOB items.

|-
| style="vertical-align: top"| {{text anchor|NAME}}
| style="vertical-align: top"| 
* [[#name|Name]]
|
| style="vertical-align: top"| Defines the name used by the reaction in-game.

|-
| style="vertical-align: top"| {{text anchor|NO_EDGE_ALLOWED}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent must not have an edge, so must be blunt. Sharp stones (produced using knapping) and most types of weapon/ammo can not be used with this token.

|-
| style="vertical-align: top"| {{text anchor|NOT_ARTIFACT}}{{verify}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent item must not be an artifact.

|-
| style="vertical-align: top"| {{text anchor|NOT_CONTAIN_BARREL_ITEM}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| If the reagent is a Barrel, it must not contain an item that has to reside in a barrel.  Barrel items appear to be lye and milk.  Alcohol appears to be covered as part of [EMPTY].  A reaction which places an item in a barrel should probably have both tags.

|-
| style="vertical-align: top"| {{text anchor|NOT_ENGRAVED}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent has not been engraved i.e. a blank memorial slab.
|-
| style="vertical-align: top"| {{text anchor|NOT_IMPROVED}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent has not been decorated.

|-
| style="vertical-align: top"| {{text anchor|NOT_PRESSED}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent must not be in the SOLID_PRESSED state.

|-
| style="vertical-align: top"| {{text anchor|NOT_WEB}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent must be "collected" - used with THREAD:NONE to exclude webs.

|-
| style="vertical-align: top"| {{text anchor|ON_GROUND}}
|
| style="vertical-align: top"| Reagent modifier
| Reagent must be on the ground. Grabs from stockpiles. Does not grab from bins in stockpiles, nor inventories (workshops, wagon). Causes infinite collection of items if reaction is in workshop, as reagents are no longer on ground when brought to workshop. Untested in adventure mode; possibly more useful for adv. mode reactions.

|-
| style="vertical-align: top"| {{text anchor|POTASHABLE}} (Deprecated)
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Alias for [CONTAINS_LYE].

|-
| style="vertical-align: top"| {{text anchor|PRESERVE_REAGENT}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent is not destroyed, which is the normal effect, at the completion of the reaction. Typically used for containers.

|-
| style="vertical-align: top"| {{text anchor|PRODUCT}}
| style="vertical-align: top"| 
*Probability of success (%)
*Quantity
*Item token:subtype
*Material token:subtype
| 
| style="vertical-align: top"| Defines a thing that comes out of the reaction. GET_MATERIAL_FROM_REAGENT and GET_ITEM_DATA_FROM_REAGENT can be used to defer the choice of material and/or item to the appropriate tag in a given reagent's material - the former comes in place of the material token, the latter replaces both the item and material tokens. See above for detailed information on how the hooks work.

|-
| style="vertical-align: top"| {{text anchor|PRODUCT_DIMENSION}}
| style="vertical-align: top"|
* Size
| style="vertical-align: top"| Product modifier
| style="vertical-align: top"| Specifies the amount of the product for those items that use dimension. For items of type BAR, DRINK, GLOB, LIQUID_MISC, and POWDER_MISC, one item is dimension 150; one item of CLOTH or SHEET is dimension 10000; and one item of THREAD is dimension 15000. Has no effect on any other item types. Note: this is not the actual [[storage]] volume of the product, which is hard-coded by the item token.

|-
| style="vertical-align: top"| {{text anchor|PRODUCT_PASTE}}
|
| style="vertical-align: top"| Product modifier
| style="vertical-align: top"| Product is created in the SOLID_PASTE state.

|-
| style="vertical-align: top"| {{text anchor|PRODUCT_PRESSED}}
|
| style="vertical-align: top"| Product modifier
| style="vertical-align: top"| Product is created in the SOLID_PRESSED state.

|-
| style="vertical-align: top"| {{text anchor|PRODUCT_TO_CONTAINER}}
| style="vertical-align: top"| 
* [[#Reagent name|Reagent name]]
| style="vertical-align: top"| Product modifier
| style="vertical-align: top"| Places the product in a container; reagent name must be the name of a reagent with the [PRESERVE_REAGENT] token and a container item type.

|-
| style="vertical-align: top"| {{text anchor|PRODUCT_TOKEN}}
| style="vertical-align: top"| 
* Name
| style="vertical-align: top"| Product modifier
| style="vertical-align: top"| Allows the product to be referred to by the given name, for the purpose of being passed down as argument in other tokens in the same fashion as reagent names.

|-
| style="vertical-align: top"| {{text anchor|REACTION}}
| style="vertical-align: top"| 
* Identifier
|
| style="vertical-align: top"| Defines a new reaction.

|-
| style="vertical-align: top"| {{text anchor|REACTION_CLASS}}
| style="vertical-align: top"| 
* CLASS_ID (custom)
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Requires the reagent's material to have a matching [[Material definition token|REACTION_CLASS]] entry. Intended for reactions which accept a variety of materials but where the input material does not determine the output material, such as FLUX (for making pig iron and steel) and GYPSUM (for producing plaster powder).

|-
| style="vertical-align: top"| {{text anchor|REAGENT}}
| style="vertical-align: top"| 
* [[#Reagent name|Reagent name]]
* [[#quantity|Quantity]]
* [[Item token]]
* [[Material token]]
|
| style="vertical-align: top"| Specifies a given reagent as an input for a reaction.

|-
| style="vertical-align: top"| {{text anchor|SKILL}}
| style="vertical-align: top"| 
* [[Skill token]]
|
| style="vertical-align: top"| Skill used by the reaction.

|-
| style="vertical-align: top"| {{text anchor|SKILL_IP}}
| style="vertical-align: top"| 
* Integer
| style="vertical-align: top"| Skill modifier
| style="vertical-align: top"| Amount of skill given per product made. Default is 30. 

|-
| style="vertical-align: top"| {{text anchor|SKILL_ROLL_RANGE}}
|  style="vertical-align: top"| 
* Range
* Multiplier
| style="vertical-align: top"| Skill modifier
| style="vertical-align: top"| Determines how [[skill]] level affects [[quality]] of the reaction product.  The skill roll is random(range) + random((skill level * multipler)/2 + 1) + random((skill level * multipler)/2 + 1). random(x) returns a number between 0 and x-1, so range is always 1 or more.  The default is 11. The default multiplier is 5. Higher skill rolls give better results.

|-
| style="vertical-align: top"| {{text anchor|TRANSFER_ARTIFACT_STATUS}}
| 
| style="vertical-align: top"| Product modifier
| style="vertical-align: top"| Transfers artifact status from the reagent to the product.

|-
| style="vertical-align: top"| {{text anchor|UNROTTEN}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent must not be rotten, mainly for organic materials.

|-
| style="vertical-align: top"| {{text anchor|USE_BODY_COMPONENT}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent material must come off a creature's body.

|-
| style="vertical-align: top"| {{text anchor|WEB_ONLY}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent must be "undisturbed" - used with THREAD:NONE to gather webs.

|-
| style="vertical-align: top"| {{text anchor|WORTHLESS_STONE_ONLY}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent is not made of an economic stone.

|-
| style="vertical-align: top"| {{text anchor|WOVEN_ITEM}}
|
| style="vertical-align: top"| Reagent modifier
| style="vertical-align: top"| Reagent material must be a woven material, eg. plant cloth, silk, yarn. This ''excludes'' CLOTH or THREAD items.

|}

== Examples ==
:''Main articles: [[Reaction Examples]]''

{{Category|Modding}}
{{Category|Tokens}}
[[ru:Reaction]]