I was trying to make a mercury thermometer, but when I deco edited the merc and heated it, the new merc was the usual colour of merc and the deco edited patch was still red.
(Bump)
In the next version, particles created when mercury expands will copy the decoration colour from the original mercury particle.
https://github.com/FacialTurd/The-Powder-Toy/commit/e4907d18815b72bb811e4ef981c8cdff4a880a1b
Thanks!