I use to 'polish' copper fixtures, till I was told it was wrong. If
something is a show piece, it's ok, you have to take the good with the
bad. However, if not, then removing the oxide layer exposes fresh
copper to oxerdize. With each polishing, a layer of metal is lost.
Now this is what was told to me, I'm no metalist.
tom @ www.FreeWorkAtHomeIdeas.com
If you want the copper to stay bright , you need a good copper polish
and then laquer it.
You can get a clearcoat in a spray can that will last quite a while.
I dont know if a sacrificial anode would be an option.
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