These universal opaque pigments can be used with Castin’Craft Clear Polyester Casting resin and Easy Cast Clear Casting Epoxy. Secondary colors such as orange and purple are easy to create by blending two or more pigments. A color blending chart is included in ETI’s “Easy Cast Resin Knobs” book. Castin’Craft Opaque Pigments are available in 1 oz. containers with drop dispenser.