Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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The esters of fatty acids with glycerol. They are generally insoluble in water and are not very soluble in cold alcohol. They are soluble in hot alcohol, as well as ether, acetone, carbon disulfide, chloroform, carbon tetrachloride, benzene, as well as other organic solvents. Fats may be hydrolized to glycerol and fatty acids by boiling them with acids and alkalies, by superheated steam, and by the action of certain enzymes, notably the lipases. When alkalies are used for hydrolysis, the fatty acids combine with the alkali to form soap; therefore, alkaline hydrolysis is sometimes referred to as saponification. Fats are used in the tannage of some leathers, in the FATLIQUORING of light leathers, in leather dressings, etc. See also: FAT TANNING ;WAX .

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