Duncan Concepts Underglaze For Ceramic Bisque, CN 244 - Really White, 16 Ounce Pint Bottle 16 Ounce Duncan Concepts Underglaze for ceramic bisque allows translucent designs with one coat and solid coverage with three coats. Concepts offer a multitude of vibrant fired ceramic colors in a balanced palette. Compatible hues in light, bright and dark options, make color selection easy. AP Certified Non-Toxic. Food-safe with the application of three solid coats or when food-safe clear glaze is applied over top and then fired to cone 06. Firing range cone 06. Made in USA.