what color are you shooting for?
you can buy epoxy putty in various primary colors as well as black & white & mix them. steel, aluminum, copper & bronze colors also are out there.
if you are desiring to match wood colors, there is a co. that makes an epoxy wood putty that comes in various wood colors with a color matching chart to tell you how much of each to mix for a particular wood color.
googling might find what you are after.
if you already have the putty & are looking for powdered pigments to add, try an artists supply store for dry pigments. you may need to experiment.
the only colorants i've tried were powdered charcoal (from burnt toast & pulverised in a mortar/pestle) or powdered wood filings, but in clear epoxy. finely chopped colored nylon paracord mixed in to clear epoxy worked as a filler for something i tried once.
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