| MadSci Network: Chemistry |
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What you did was run an electrochemical reaction in which small amounts of
copper salts were formed (possibly copper carbonate or copper hydroxide).
Solid copper salts are often green. Copper tends to take on this color, called
a "patina", on exposure to water; patina formation is hastened by electrical
discharges.
The color of the Statue of Liberty is a result of this process.
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Try the links in the MadSci Library for more information on Chemistry.