Mayco CGSKIT-4 Crystal Glaze Kit for Ceramics - Set of 8 Best Selling Colors in 4 Ounce Jars with Free How to Paint Ceramics Booklet Mayco Crystal Glazes transform in the kiln when small pieces of glass burst into color and intricate pattern during the firing process. Use alone for stunning effects, either as an accent to your design, or in glaze combination blending with Stroke and Coats, Foundations, or other glazes. Mayco Crystal Glazes include both Jungle Gems and Crystalite glazes, and enable you to add texture and depth to your designs with ease. Mayco Crystal Glazes are designed to mature at cone 06/05. Certified Non-Toxic. Not recommended for use on dinnerware. Made in USA. Kiln required. Also included is a Free How To Paint Creative Hobbies Bisque: Fired Finish Booklet published exclusively by Wholesale Craft Outlet.