The fine impalpable soot obtained from the smoke of carbonaceous substances which have been only partly burnt, as in the flame of a smoking lamp. It consists of finely divided carbon, with sometimes a very small proportion of various impurities. It is used as an ingredient of printers' ink, and various black pigments and cements.
- Fine soot collected from incompletely burned carbonaceous materials, used as a pigment and in matches, explosives, lubricants, and fertilizers. Also called blacking.