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The document contains two sources about ancient civilizations. Source A is a photograph of the Iron Pillar from the Gupta period in India, which still stands in Delhi without rusting. Source B is an account of weapons found with Qin Dynasty clay warriors in China. The well-made weapons had not rusted or lost their shine and sharpness due to the Qin metalworkers coating them with chrome, an anti-rust metal, a technique not discovered in Europe until the 1930s.
