Question

A man wearing copper ring, acquires a green color stain on his skin under the ring. Why does this happen?​

Answer 1

Answer:

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.