Why do you think steeples and roofs might appear green, but a copper square does not?
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Many steeples and roofs made with copper are not that brown color, however. Instead, they are green. Something happened to the copper on those buildings so that it no longer appears brown like the brown color of a copper penny. ... The green color appeared because a chemical reaction took place.
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because the algea or spyrogra doesn't make copper host
there are too many tiny holes in roof so
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