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In page Bronze:
"Tin bronze was superior to arsenic bronze in that the alloying process could be more easily controlled, and the resulting alloy was stronger and easier to cast. Also, unlike arsenic, metallic tin and fumes from tin refining are not toxic. The earliest tin-alloy bronze dates to 4500 BCE in a Vinča culture site in Pločnik (Serbia).[4] Other early examples date to the late 4th millennium BCE in Egypt, Susa (Iran) and some ancient sites in China, Luristan (Iran) and Mesopotamia (Iraq).[citation needed]
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