Bronze is the first alloy invented in history! It’s a metal made of 80 - 90% copper and 10 - 20% tin. It is the most popular sculptural material because it expands when hot and shrinks as it cools, which makes it easier to transfer impressions from the mold. The oldest bronze sculpture is thought to be “Dancing Girl from Mohenjodaro,” circa 2500 B.C. Bronze has been made into weapons, statues, monuments, tools, mechanical parts, and many other items since ancient times. 
