Pebeo Vitrea 160, Glass Paint Iridescent Medium, 45 ml Bottle Iridescent Medium is used to add shimmer to Vitrea 160 glass paints Can also be used in liberal quantities to create iridescent pastel colors Once fully dry, bake for 40 minutes in a domestic oven at 160 C (325 F) for dishwasher, uv and microwave resistance For use on all surfaces that can sustain baking instructions, including glass, crystal, porcelain, china, glazed earthenware, terracotta, metal, enameled sheet steel, and copper Available in 45 ml bottle