Are you asking if you should clean it or if it has been cleaned? A cleaned copper coin will generally have fresh bright "new" copper look on high points with the common browning in the field. If a copper coin has been dipped it often has a pinkish look to the cleaned copper, very ugly and not desirable at all. Copper that has been cleaned with a polish then aged often ends up with the gasoline rainbow effect but this also happens naturally, a trained eye can spot the difference immediately.
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