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Linseed oil
 
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Linseed oil, also known as flaxseed oil is a colourless to yellowish oil obtained from the dried, ripened seeds of the flax plant (Linum usitatissimum, Linaceae). The oil is obtained by pressing, sometimes followed by solvent extraction. Flax-based oils are sought after as food because of their high levels of α-Linolenic acid (a particular form of omega-3 fatty acid), but it is important that only food-grade oil be used for food. Boiled linseed oil is heated and treated with chemicals that make it unfit for human consumption. Linseed oil is a drying oil, meaning it can polymerize into a solid form. Due to its polymer-forming properties, linseed oil is used on its own or blended with other oils, resins, and solvents as an impregnator and varnish in wood finishing, as a pigment binder in oil paints, as a plasticizer and hardener in putty, and in the manufacture of linoleum. Linseed oil use has declined over the past several decades with increased availability of synthetic alkyd resins—which function similarly but resist yellowing. This video is targeted to blind users. Attribution: Article text available under CC-BY-SA Creative Commons image source in video
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