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Overview

Fluid mixing recipes define how the Fluid Mixer combines two or three fluid inputs to produce a new fluid output. The machine performs order-independent matching: any combination of the listed input fluids in any slot order will trigger the recipe. Each recipe requires 1 to 3 fluid inputs and produces exactly 1 fluid output.

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Recipe Type ID

gm:fluid_mixing

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JSON Format

Fluid mixing recipes are stored under data/<namespace>/recipe/ in a datapack. 
{
  "type": "gm:fluid_mixing",
  "inputs": [
    {
      "fluid": "gm:sulfur_dioxide",
      "amount": 1000
    },
    {
      "fluid": "minecraft:water",
      "amount": 1000
    }
  ],
  "result": {
    "fluid": "gm:sulfuric_acid",
    "amount": 1000
  }
}

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Fields

FieldTypeRequiredDescription
typestringyesMust be gm:fluid_mixing.
inputsarrayyesList of 1–3 SizedFluidIngredient objects. Each specifies which fluid(s) are accepted and the required amount in millibuckets.
resultobjectyesThe output FluidStack. Requires fluid (registry ID) and amount (millibuckets).

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Input (SizedFluidIngredient) format

Each entry in inputs is a NeoForge SizedFluidIngredient using the nested codec. The most common forms are: Single fluid: 
{
  "fluid": "gm:crude_oil",
  "amount": 1000
}
Fluid tag: 
{
  "tag": "c:fluids/water",
  "amount": 500
}

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Result (FluidStack) format

{
  "fluid": "gm:refined_fuel",
  "amount": 1000
}
Amounts are in millibuckets (mB). One standard bucket = 1000 mB.

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Adding Custom Fluid Mixing Recipes via Datapack

  1. Create a datapack with the following layout: 
    my_datapack/
└── data/
    └── my_mod/
        └── recipe/
            └── my_fluid_mixing_recipe.json
  2. Write the recipe JSON following the format above.
  3. Place the datapack in the datapacks/ folder of your world, or package it inside a mod’s resources/data/ directory.

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Example: two-fluid reaction

{
  "type": "gm:fluid_mixing",
  "inputs": [
    { "fluid": "gm:sulfur_dioxide", "amount": 1000 },
    { "fluid": "minecraft:water",   "amount": 1000 }
  ],
  "result": {
    "fluid": "gm:sulfuric_acid",
    "amount": 1000
  }
}

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Example: three-fluid reaction

{
  "type": "gm:fluid_mixing",
  "inputs": [
    { "fluid": "gm:crude_oil",  "amount": 2000 },
    { "fluid": "gm:hydrogen",   "amount": 1000 },
    { "fluid": "minecraft:water", "amount": 500 }
  ],
  "result": {
    "fluid": "gm:refined_fuel",
    "amount": 2000
  }
}

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Example: single-fluid processing

{
  "type": "gm:fluid_mixing",
  "inputs": [
    { "fluid": "gm:crude_oil", "amount": 1000 }
  ],
  "result": {
    "fluid": "gm:heavy_oil",
    "amount": 750
  }
}

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JEI Integration

Fluid mixing recipes are visible in JEI under the Fluid Mixer category. You can:
  • Press R on any fluid bucket to see if it is produced by a fluid mixing recipe.
  • Press U on any fluid bucket to see which fluid mixing recipes consume it.
  • Click the Fluid Mixer icon in the JEI category list to browse all fluid mixing recipes.

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