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Fatty acids (saturated and unsaturated)

A fatty acid is a carboxylic acid with a long, aliphatic chain. This chain is either saturated (it has no double bonds) or unsaturated (it contains double bonds). In oil paint, fatty acids are obtained from triglyceride molecules. The most common fatty acid found in linseed oil is linolenic acid, which has 18 carbon atoms and three double bonds.