Encyclopedia
Fatso
Grease is a sticky fat with an unpleasant odor extracted from the soap water used to wash wool or card wool. It can also be extracted from fatty wool using volatile solvents (carbon disulfide, etc.). Grease does not contain glycerides and therefore chemically it is more of a wax than a fat. It is used in the production of lubricants and for other industrial purposes, but most often it is used as lanolin (its purified product) or for the extraction of olein or stearin.
Source: "Explanations to the Harmonized System of the Russian Federation's Foreign Economic Activity Commodity Nomenclature (HS Russia)" (prepared by the Federal Customs Service of Russia) (volume 1, sections I - VI, groups 1 - 29)