Cleaning a coin, what have I formed?

Discussion in 'Coin Chat' started by The Beatles, Feb 14, 2013.

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  1. John Anthony

    John Anthony Ultracrepidarian

    You made a nightcap.
     
    John Anthony, Feb 15, 2013
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  3. Kentucky

    Kentucky Supporter! Supporter

    A copper surface discolors fairly fast due to the reaction of copper with oxygen to form oxides of copper. These oxides of copper will react with acetic acid (vinegar is 5% acetic acid) to give copper acetate, hence the blue color. Nickel should also react with acids, but the reaction is slow.
     
    Kentucky, Feb 16, 2013
    #22 + Quote Reply
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