Grumbacher Poppyseed Oil is an oil paint additive similar in application to linseed oil. Poppyseed oil is especially good for use with pale colors, as it is excellent at color retention and is often used for alla prima techniques. Unlike linseed oil, it is not for use with multiple layer techniques. It may be diluted with Turpentine, Grumtine and Pre-tested Odorless Thinner. Made in the USA.