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Copper oxide, which is a compound from the two elements copper and oxygen. When copper is exposed to oxygen for a long period of time, it begins turning green. The green is Copper oxide.

Copper oxide can refer to

  • Copper(I) oxide (cuprous oxide, Cu2O), a red powder;
  • Copper(II) oxide (cupric oxide, CuO), a black powder. (Source wikipedia)
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14y ago

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