Grayish-white discoloration which is not eliminated by simple varnishing may be ultramarine sickness, which occurs through the action of acids on ultramarine or by microfissures in the paint layer which diffuse light. (This effect is considered common with dark pigments having a higher proportion of paint medium.) A methacrylate-pine oil mixture (Glasure 40X one part: pine oil nine parts) used in concert with Shellsol and a silk pad evenly penetrated the tested paint film after repeated use and relining of the painting with wax resin and a glass fabric support. Eight years later the colors are still con sidered bright. Materials are further defined. -- AATA