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Why does copper leave a green / black mark on the skin?

 

The green mark on the wrist is a natural reaction of copper oxidisation, which is not harmful. The acid in your sweat solution dissolves the copper which is then absorbed into the blood stream through the skin, the copper is then distributed to all parts of the body and deposited where there is a copper deficiency. Research through the years has shown that people suffering with joint stiffness and aches and pains have a copper deficiency.

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