Polymerized linseed oil made by heating pure linseed oil to high temperatures in the absence of air. High-viscosity, non-yellowing. Intended for use with oil painting mediums, as well as diluted with conventional solvents. Improves fluidity of paint and assists in laying down (smoothing out) brush strokes. Slow drying and improves dry paint film flexibility. May be diluted with any conventional oil painting solvents. Made in USA.