The easiest way to add colour to bisque is with Duncan Concepts Underglazes for Bisque. Duncan Concepts Underglazes for Bisque makes the Ceramic Arts experience quick and easy. Concepts Underglazes formula allows translucent designs with one coat and solid coverage with three. Concepts offer a multitude of vibrant fired ceramic colours in a balanced palette. Compatible hues in light, bright and dark options, make colour selection easy. AP Certified Non-Toxic. Food-safe with the application of three solid coats or when food-safe clear glaze is applied. Firing range cone 06 to cone 6. Made in USA.