I think spraypaint might be risky, but worth a test at least. One stockmaker recommended lampblack (candle soot) as a good bedding pigment. Seems to be plenty of guidance on google on gathering it effectively, but I've never tried it myself. Might be a good idea to fire off any wax residue in the oven? I'll see if I can find his advice.
Edit: Here it is: Extremely basic process! Run a lit candle under a piece of metal (steel usually) close enough to impinge on the flames, but not close enough to hit the metal with the wick (it might leave some wax on the metal) until a thin layer has been built. Scrape it off with a knife edge into your epoxy and stir it in...
It takes very little to get epoxy very black.
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