Goes green, say?
I believe the answer is:
dyes
(Other definitions for dyes that I've seen before include "Substances for staining or colouring" , "Many a pigment" , "turns green, possibly" , "Stains" , "Colouring materials" .)
I believe the answer is:
dyes
(Other definitions for dyes that I've seen before include "Substances for staining or colouring" , "Many a pigment" , "turns green, possibly" , "Stains" , "Colouring materials" .)