Well if nobody here has lived in S. Korea, the country is naturally a very rust prone country. You will see a lot of the older apartments have turned brownish-green, like the statue of liberty. YEAH the apartments aren't made out of copper but the paint and ETC rusts a lot do to the humidity. Thats the best explanation i can give, it might not be as bad for others, unless they too are in a very humid country like S. korea.
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