why did the copper on the statue of liberty turn green but copper mugs and copper pipes don’t?
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Copper pipes do oxidize and turn green over time, especially in wet environments. I assume copper mugs do too if you don’t clean them regularly.
However it takes quite a while for a green patina to form on bare copper. According to some cursory googling it took the Statue of Liberty between 20 and 40 years to turn totally green. It was also completely exposed to rain, unlike most household copper piping, and industrial air pollution supposedly had an affect also.
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