Ah - that's the stuff! Does it eat copper oxide too? It would be poor if it ate the metal and left the oxide! On the otherhand you'll remove copper whether you etch it or abrade it, so surely so long as the contact is not sustained too long, you should be Ok....
However, there must be something that at least loosens the oxide. I understand that museum preparators have compounds that remove or loosen paratacamite from bronze artifacts, so there must be something out there?
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Tall men see everyone else's bald patch but their own.......
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