lampblack

[lamp-blak]
noun
a fine black pigment consisting of almost pure carbon collected as soot from the smoke of burning oil, gas, etc.

Origin:
1590–1600; lamp + black

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World English Dictionary
lampblack (ˈlæmpˌblæk)
 
n
a finely divided form of almost pure carbon produced by the incomplete combustion of organic compounds, such as natural gas, used in making carbon electrodes and dynamo brushes and as a pigment

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
In other instances the same concrete and lampblack mixture used for the sidewalk will be used.
He turned his hand to ink making and sold to printers a mixture of lampblack and varnish by the keg.
One day, as an experiment, he blackened some red worsted with lampblack.
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