when a copper object is exposed to moist air for a long time , a green coating is formed what is the material of the green coating
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it was effect of corrosion
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Copper turns green because of chemical reactions with the elements. Just as iron that is left unprotected in open air will corrode and form a flaky orange-red outer layer, copper that is exposed to the elements undergoes a series of chemical reactions that give the shiny metal a pale green outer layer called a patina.
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