Flax is grown for its seeds, which can be ground into a meal or processed into linseed oil, which is used as a nutritional supplement as well as an ingredient in many wood-finishing products. Flax seeds produce flax seed oil, also known as linseed oil, which is one of the oldest commercial oils. It is an edible oil obtained through expeller pressing and, in some cases, solvent extraction. For centuries, solvent-processed flax seed oil has been used as a drying oil in painting and varnishing.
