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What is green copper?

  1. Mar 20, 2005 #1


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    Pure copper metal is orange (or pink after being anodized), copper hydroxide is blue, copper oxide is black. So then why is the statue of liberty green?
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  3. Mar 20, 2005 #2


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    Supposedly its oxidation... and ive seen copper turn green though too..
  4. Mar 20, 2005 #3

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    I've seen lots of old pennies turn green. Must be the same thing.
  5. Mar 20, 2005 #4


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    I'm no chemist, but I believe there are several different oxidation states of copper, one of which is green.

    - Warren
  6. Mar 21, 2005 #5
    My guess was copper sulfate, but I looked it up and its probably more likely copper carbonate. As you may have learned in your intro chem classes(especially if your teacher was an environmental guy like mine) water reacts with carbon dioxide to form carbonic acid, which gives all rain its slight acidity. This carbonic acid will then react with the copper to form cupirc and cuprous carbonate.
  7. Mar 21, 2005 #6
    sulfates and acetates will turn it green.
  8. Mar 21, 2005 #7


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    Staff: Mentor

    Last edited by a moderator: Aug 13, 2013
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