A terribe 2000 wide am, can I save it r should I let it go

But I can't let it go, how do I stop the corrosion or whatever it's called???

 

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http://www.wizardcoinsupply.com/products/verdi-care.html

 

oh, its called "verdigris"

1. a bright bluish-green encrustation or patina formed on copper or brass by atmospheric oxidation, consisting of basic copper carbonate.

 

That's pretty advanced corrosion. Verdicare won't help much but it's better than nothing. I'm not sure what one of those are worth but it's probably best to treat it and then holder it. I'd still want to own that