boneblack

boneblack

[bohn-blak]
noun
a black, carbonaceous substance obtained by calcining bones in closed vessels, used as a black pigment, a decolorizing agent, etc.
Also, bone black.


Origin:
1805–15; bone1 + black

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World English Dictionary
boneblack (ˈbəʊnˌblæk)
 
n
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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