Developed to perform at mid-range temperatures (Cone 5-6), these glazes can be successfully used at Cone 10. Speedball Stoneware Glazes are forumlated to be friendly in application and firing. Artists can expect consistent and striking results when fired as directed. For best results, apply 2-3 liberal coats. All colors are dinnerware safe when used and fired as directed. All colors are lead-free.