Mekanism adds it's fair share of chemicals, which you must have encoutered while playing with it: Gases, Infuse Types, Pigments, and Slurries.

In the old age of 1.12.2, adding custom gases was only a thing MekaTweaker, an addon mod could do. However, as of Mekanism V10.1, Mekanism now has native support for adding custom chemicals through CraftTweaker and it's own CraftTweaker loader.

The name of this custom loader is: mekanismcontent, don't forget it at the top of the file!

The most basic functions you have access to can be found in the ChemicalBuilder class.

ZenScript
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#loader mekanismcontent

import mods.mekanism.content.builder.GasBuilder;
import mods.mekanism.content.builder.InfuseTypeBuilder;
import mods.mekanism.content.builder.PigmentBuilder;
import mods.mekanism.content.builder.SlurryBuilder;

/*
 * Adds five very simple chemicals to show a very basic usage of the content creation capabilities provided. Custom content needs to be created in the mekanismcontent loader and requires a full game restart to take effect as well as have names defined in a lang file. One thing to note is that these examples are extremely basic and there is quite a bit more that is possible with this system including using custom textures and adding various attributes.
 * 1) Creates an example Gas that is colored magenta.
 * 2) Creates an example Infuse Type that is colored green.
 * 3) Creates an example Pigment that is colored yellowish green.
 * 4) Creates an example Dirty Slurry that is for a yellow ore.
 * 5) Creates an example Clean Slurry that is for the same yellow ore.
*/

GasBuilder.builder().color(0xDF03FC).build("example_gas");
InfuseTypeBuilder.builder().color(0x3FC0B).build("example_infuse_type");
PigmentBuilder.builder().color(0xCAFC03).build("example_pigment");
SlurryBuilder.dirty().color(0xF0FC03).build("example_dirty_slurry");
SlurryBuilder.clean().color(0xF0FC03).build("example_clean_slurry");

The list of builders you can use to create custom Mekanism content is the following:

• GasBuilder
• InfuseTypeBuilder
• PigmentBuilder
• RobitSkinBuilder
• SlurryBuilder

It is worth knowing that all Builders that refer to a Chemical extend ChemicalBuilder.

The list of Attributes you can use right now in your custom Mekanism chemicals is the following:

• Gas Attributes:
  • CoolantAttribute
  • FuelAttribute
  • RadiationAttribute