Speedball 001056 Underglaze, Royal Blue, 16OZ Ideal for detailed painting, sgraffito decoration, watercolor effects, free brush painting, and mishima decoration Opaque underglazes - will not move or bleed Designed to perform in a wide firing range, Cone 06-6, can be successfully fired at Cone 10 For best resulets, apply 2-3 liberal coats Lead-free, dinnerware safe when used and fired as directed