Sanxingdui (literally "Three star mound") is an ancient Chinese city where archaeologists discovered remarkable artifacts that radiocarbon dated circa 12th-11th centuries BCE, and Sanxingdui is the name given to this previously unknown Bronze Age culture. This ancient culture had remarkably advanced bronze casting technology which was acquired by adding lead to the usual combination of copper and tin creating a stronger substance that could create substantially larger and heavier objects.
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