text: Initially, copper is oxidized to the cuprous ion:
  (1) Cu → Cu + e
  The cuprous ion reacts with the chloride ion to form the insoluble white colored salt cuprous chloride:
  (2) Cu + Cl → CuCl
  The cuprous chloride reacts with atmospheric moisture and oxygen to form a green cupric chloride/cupric hydroxide compound and hydrochloric acid:
  (3) 4 CuCl + 4 HO + O → CuCl·3 Cu(OH) + 2 HCl
  The remaining copper is oxidised by air to the cuprous ion:
  (4) Cu → Cu + e
  The cuprous ion reacts with the chloride ion in the hydrochloric acid to form the insoluble white colored salt cuprous chloride:
  (5) Cu + Cl → CuCl
  The reaction then repeats from equation (3). It is the presence of two different white and green salts that lead to the fuzzy green appearance.