I dont know how to use filter aside from changing its temp to make colors from blue to red, but im trying to make a purple laser.
use https://powdertoy.co.uk/Wiki/W/Element:FILT.html
also i think theres a .tmp mode for doing that but im not sure
Well, you can serialize it for more colors, but if you don't know how to serialize it, you can ask me for a filt sample.