The newest thing in copper and bronze metal clays! Five Star Metal Clay has all of the features you desire in base metals; fires simply and fast, ultra refined metal powders create a smooth finish, easily carved and worked on cutting machines, all colors can be fired together, and comes in five great metals! Five Star White Bronze should be fired in a kiln in activated coconut carbon. Kiln firing is 1300F for 30 minutes to an hour. Clay shrinks between 12-15% depending on firing schedule.