Art Clay Bronze(TM) is a clay material for creating a wide range of pieces such as jewelry, craft designs, and objects like sculptures and models. Art Clay Bronze must be fired in an activated carbon under reducing atmosphere using a programmable electric kiln, with the resulting fired piece being solid alloy (Copper 90%, Tin 10%). It’s easy to achieve a beautiful mirror golden finish, even by hand. Art Clay is now the only brand to have fine silver, sterling silver, copper, and bronze formulas, all of which are compatible with each other, given specific techniques. Provided in foil packages containing 50 grams of bronze clay.