Can RIT powdered clothing dye in black be used to darken JB weld, or other grayish epoxies?
Possibly, but may not be very light stable... especially when a little candle soot will give a very nice black, cheaply and easily, while making the epoxy stronger and harder.
Serious question - how do you collect candle soot to add to the epoxy? I've previously used black liquid dye.
Unrelated - one of these days I'm going to resurrect that old 'Photo Milling' thread you helped me with to show some stock building progress. If I ever find time between family, work and chores, that is.