platinum fit keto  Almost each and every metal on this earth is looked upon as a strong and stable material. But even after that the mighty environment affects these metals as well. Prolonged exposure to the air can lead to the process of rusting in iron. Similarly copper too is susceptible to such alterations and due to this reason it develops a green patina. The reason for the same is that the oxygen from the air leads to the formation of the patina.

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