Soot
Soot is formed as a result of incomplete combustion or cracking (by heating, the action of an electric arc or electric spark) of organic substances rich in carbon, such as:
1) natural gases, such as methane, anthracene-rich gases (i.e., gases enriched with anthracite) and acetylene. Acetylene soot, a very fine and pure product, is obtained by the immediate decomposition of compressed acetylene caused by an electric spark;
2) naphthalene, tars, oils (lampblack).
Soot can also be called channel gas soot or furnace soot depending on the method of production.
Soot may contain oily impurities.
Soot is used as a pigment for the production of paint, printing ink, shoe polish cream and others, for the production of carbon paper and as a reinforcing filler in the rubber industry
Source: "Explanatory Notes to the Harmonized System of Goods Nomenclature for Foreign Economic Activity of the Russian Federation (HSN of Russia)" (prepared by the Federal Customs Service of Russia) (volume 1, sections I - VI, groups 1 - 29)