channel black

noun Unabridged

gas black

the soot of a natural gas flame, used in paints; fine carbon.
Also called channel black.

1880–85 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gas black
finely powdered carbon produced by burning natural gas. It is used as a pigment in paints, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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