Linseed oil is extracted from Flax seeds. In the raw state it does not dry very well if used as a finish for wood. It is however, an essential ingredient for French Polishing and for making Boiled Linseed Oil. Boiled Linseed oil is a well known oil used in finishing wood. It is made by heating refined Linseed oil and adding driers to improve its drying properties. It can be used alone or with varnish to give an oil varnish finish. It is also used in the revised Michelman varnish formula. Varnish makers linseed oil has been refined to remove the “break” so that it will not become cloudy on heating to make varnish.