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I believe the copper comes from using acid to clean the brass, which removes some of the zinc. Theoretically, polishing through the copper would get you down to a brass colored mixture again. I would suggest trying it on a spare piece of brass first before working on valuable things.
Nope,brass is an alloy of copper and zinc,the coppering marks on brass is the result of electrolysis leaching the zinc content out of the brass,leaving copper.
Most commonly found on brass that has been in the ground for some period of time.
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