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What is the property of copper that makes pennies turn a bluish green color?

April 26, 2017bluish color Copper Pennies Property turn

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What is the property of copper that makes pennies turn a bluish green color?

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Many corrosion products of copper are colored blue to green. These include the green cuprous and cupric chlorides, the green carbonate (malachite), the blue carbonate (azurite), and blue sulfate.