Speedball presents 24 liquid, opaque colors that will not move or bleed, making them perfect for detailed painting, graffito and design work. They may be applied to greenware or bisque and can also be blended. The underglazes are compatible with both the earthenware and stoneware-covering glaze, and may be used for a variety of decorating techniques. Firing Range: Cone 06 up to Cone 6