@RedVelvetCake(View Post) Deco color, or actual color? The default color of an element (for example, water being blue) can only be changed per-element, not per-particle. Deco color can be set on any particle.
For deco color, set the "dcolor" property using the methods I mentioned earlier For actual color, do elem.property(ID, "Color",0xFF0000FF), where ID is the ID of the element you want to set, and the hex thing is the color in RGBA format
Edit: actually, it sounds like you may want to use a graphics function here. Check the "legacy" api section on the wiki, it should be near the bottom. It's not an entirely simple explanation.
Oh I think that requires graphics update functions, jacobq can help you with that. also, I messed up the order lol: elements.property(id,"Color",1234) I cant test because I am on my phone