i want to add black pigment to molten beeswax & tallow. powdered pigment-- such as tempera paints leave the wax a bit too "gritty" would oil-based paint work ? i mean artists' oil paint.
Yeah I think Sam is right. Lamp black is going to be about the finest black pigment your going to find. The only way to get finer than that is to go to a dye. I don't know of any dyes that are not either water or alcohol based.
Monk Mike Dubber makes a transfer wax from lip gloss and he adds graphite to it to darken it. I have made it and it does work well. I found a bottle of graphite at ACE hardware.