Grumbacher Sun-Thickened Linseed Oil Medium for Oil Paintings, 2-1/2 Oz. Jar, #5832 Can be added directly to oil paint to make colors glossy and fluid Heavier in body than traditional linseed oil Extremely flexible with excellent resistance to yellowing Can be pre-diluted with Turpentine, Grumtine, or Pre-tested Odorless Paint Thinner Made in USA