Introduction
Chemistry in Sandboxels is about elements, reactions, heat and mixing. The main chemistry mod in this directory is Chemistry (chem.js, by lllllllllwith10ls), which adds several chemistry and physics-related elements. NoUser's Things (nousersthings.js) adds many chemical elements and compounds as well. This guide helps you use them well, rather than listing every reaction — reactions are best discovered by experimenting, with the source as your reference.
Start with the base game first
Before enabling a chemistry mod, spend time with vanilla elements: water, fire, acids, metals and gases. You will then notice what a chemistry mod actually adds, instead of treating everything as new.
A practical chemistry session
- Enable
chem.jsalone first. - Pick one new element and test it against water, fire, air and a metal, one at a time.
- Note what reacts, what does nothing, and what is dangerous to other elements in your scene.
- Only then add a second chemistry mod, and re-test the same combinations — that is how you spot overlaps or conflicts.
Liquid mixing
Liquid Mixing (liquid_mixing.js, by Nekonico) makes liquids mix colours dynamically. It is a physics and visual change as much as a chemistry one: use it when you want to see mixing, not when you need precise, repeatable reactions for a scene.
Safety in the sandbox
"Safe" here means safe for your scene, not for real chemistry. Keep a save before experimenting with reactive elements, work in a contained area, and do not blame a mod if a reactive element destroys a scene you did not save.