bone·black also bone black (b n bl k )n. 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. |
boneblack [ˈbəʊnˌblæk]
n
(Clothing, Personal Arts & Crafts / 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
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