Unlike tattoo gun, engraving self with gaslight chisel does not give colorization option

In crystal form self can be engraved but this does not give dialogue to change the primary or secondary color on character tile. Presumably this is the same with robots or others who can’t be tattooed. I have multiple arms as crystal and also am not allowed to tattoo the parts of me that aren’t crystal (unless these are also crystal but that’s not clear).