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Originally, the Statue of Liberty was green, due to the fact that it is made of copper. However, after years of exposure to outdoor conditions, sulfuric acid in the rain has reacted with the copper, corroding the copper to produce copper salts. Copper can corrode into different colours depending on the conditions it is exposed to; in normal outdoor exposure, as is the case with the Statue of Liberty, copper usually corrodes into a blue-green colour.

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14y ago

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