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tintin, no, a penny is an alloy and is too hard. I dropped a piece of pure copper in yesterday's mail for you, so you'll have it in a few days.

A copper scouring pad would work just fine if it is...

I learned about using copper when learning how to preserve civil war guns. With museum things you want to preserve what is there and not make any changes. the copper won't change anything, but will...

In my opinion, sanding isn't the way to remove rust unless you want to sand out the pitting.

A little piece of pure copper is the way to go. It's harder than the rust and not as hard as the...