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boneblack

or bone black

[ bohn-blak ]

noun

  1. a black, carbonaceous substance obtained by calcining bones ( def ) in closed vessels, used as a black pigment, a decolorizing agent, etc.


boneblack

/ ˈbəʊnˌblæk /

noun

  1. 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
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of boneblack1

First recorded in 1805–15; bone ( def ) + black
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Example Sentences

While they may improve conditions somewhat, the only solution to such a problem is the use of the boneblack process.

Animal charcoal or boneblack.—This material is made from bones of animals, by burning them in a kiln built for that purpose.

The following is commended for the preparation of a black ink or paste for use with stencils:—Boneblack, 1 lb.; molasses, 8 ozs.; sulphuric acid, 4 ozs.; dextrine, 2 ozs.; water sufficient.

Muriate of potash costs $40 and upwards per ton, sulfate about $48, dissolved boneblack about $24, ground bone about $30, kainit about $13, and nitrate of soda about 2-1/4 cents per pound.

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