Whydo copper vessels lose their shine when exposed to air?
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One of the main reason why the copper vessels lose their shine when exposed to air is due to the passivization. ... At the surface of vessel, Copper atoms react with the Oxygen atoms in the air forming copper-oxide.
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When copper vessels are exposed to air they react with oxygen to form copper-oxide. This is due to oxidation. As a result the vessel turns blackish-brown
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