objects made of what acquire a green coating on the surface when list in open a few days
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Copper acquire green coating on it , when it expose to atmospheric oxygen with hydroxide, and then copper oxide expose to carbon dioxide to make copper carbonate, which gives it a green colour. This process is called corrosion of copper.
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copper metal when exposed to air turns green in color due to corrosion, when copper metal exposed to air in rainy season,the metal react with gases and moisture and atmosphere gases to form a mixture of copper carbonate and copper hydroxide. this gives a green color to the surface of copper metal .
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