Bronze is an alloy of copper. "True" bronze i 905copper and 10 % tin. The composition of bronze can vary widely. There are three other major types, statuary bronze 97%copper 2%tin and 1%zinc, architectural bronze 57% copper 40% zinc 3% lead, and commercial bronze 90% copper 10% zinc. For more information see http://w3.gsa.gov/web/p/hptp.nsf/0/6c8c800d5618e023852565c50054b2c6?OpenDocument
