The Masters often used paint called Casein which is a milk based paint. I happened to come across some in an art store and thought how much fun it would be to try it. This is a small painting, 6 x 6 inches, done on masonite. Casein has a lovely matte finish. After it dried, I applied the recommended varnish which did not disturb the calm finish. I will definitely order more and try this on a bigger painting.