Opulence Envirocolors have a satiny matte surface with 10 earthy colors available. They are compatible with Opulence Gloss and Reduction-Look glazes. The Envirocolors do not flow when used alone, but give a color variation with textured surfaces. Designed for Cone 6 electric firing, we have had success with tests in C/10 gas reduction and C/10 wood firing. They are completely barium and lead-free and are microwave and dinnerware safe.