why objects made of copper develop a greenish coating over them with the passage of time
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Copper metal when exposed to air turns green in colour due to corrosion. When copper vessel is exposed to air in rainy season, the metal reacts with gases and moisture and atmospheric gases to form a mixture of copper carbonate and copper hydroxide. This gives a green colour to the surface of copper metal.
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Due to corrosion copper develop a greenish coating over time. This happen in Silver and other metal also.
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