It has always been my understanding patina was what developed on brass or copper after being exsposed to water. The Statue of Liberties green color is the perfect example I think everyone has seen. The green oxidation build up. I hear patina used alot to desrcibe rusting on signs and metal objects all the time. Is this just a way to "church up"rust or is their a difference? I would like to hear as many facts or opinions on this subject as possible.

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