Linseed oil is used as an ingredient in paints, stains and varnishes, as well as a preservative for concrete and wood. It is also used in many inks, soaps and aids in the production of linoleum. Food-grade linseed oil is used in recipes as a binder.
Linseed oil is extracted from dried flax seeds of both the yellow and brown variety. Flax is known to be one of the oldest cultivated crops in the world. The heat treatment changes the structure of healthy oils. Flax seeds are first boiled, and seeds are then passed through solvents that extract the oil.