These colors are produced with a Mineral Spirit based acrylic resin system. They dry quickly to form durable films, with water and ultraviolet resistance, and excellent chemical resistance to acids and alkalis. All pigments have been chosen for the greatest clarity and permanency within each chemical class. Useful in art conservation for inpainting. MSA Acrylics remain permanently soluble in mineral spirits. They are miscible with oil and alkyd paints. Sold in 1 oz jars.