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bone·blackalso bone black (bōn′blăk′)
A black pigment containing about 10 percent charcoal, made by roasting bones in an airtight container and used in polishes, as a filtering medium, and in decolorizing sugar. Also called bone charcoal.
(Dyeing) a black residue from the destructive distillation of bones, containing about 10 per cent carbon and 80 per cent calcium phosphate, used as a decolorizing agent and pigment
a black carbonaceous substance obtained by calcining bones in closed vessels, used esp. as a pigment.