carbon black

noun

1. any of various finely divided forms of amorphous carbon prepared by the partial combustion of hydrocarbons, as of natural gas, or by charring wood, bones, or other plant or animal tissues: used in pigments, as reinforcing agents in the manufacture of rubber products, and as clarifying or filtering agents.

noun

1. a black finely divided form of amorphous carbon produced by incomplete combustion of natural gas or petroleum: used to reinforce rubber and in the manufacture of pigments and ink