Sax True Flow Bright Yellow Underglaze comes in concentrated opaque liquid colors. They are ready to be used on clay/greenware or bisque. Underglaze has a matte effect when fired. Cover with a transparent glaze for surface shine and richer color. Glaze may be a different color during application and will change to desired look after required firing in a kiln. Color does not change when fired at Cone 6. Freeze/Thaw stable. Download Sax True Flow Glaze Care Tips