A kind of amorphous carbon. Light, loose and very fine black powder, specific surface area is very large, ranging from 10-3000m2 / g, is organic (natural gas, heavy oil, fuel oil, etc.) under the conditions of insufficient air by the incomplete combustion or thermal decomposition derived product. Made of the proportion of 1.8-2.1 by the gas called "black gas", made from the oils known as "black light", made by the acetylene called "acetylene black." There are also "slot Black" and "furnace black." Distinguish between the performance by carbon black "Carbon black", "Conductive Carbon Black", "wear black" and so on. Can be used for black dye, used in the manufacture of Chinese ink, printing ink, paint, etc., are also used to make rubber reinforcing agent.