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I'm guessing it would be useless strength wise
The small amount you need to add to make it black isn't going to have much effect on the strength. Save yourself time and trouble by using https://www.brownells.co.uk/ACRAGLAS-DYES, as the Constable says, running your own powder mill to try to make something suitably finely divided will be messy, dangerous, and probably ineffective.
gbj_tester
/\ lmao
Could you use carbon powder and epoxy resin to make, say, chess pieces (or any small fairly intricate stuff)?
I'm guessing it would be useless strength wise