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Acid "tested" coins (car battery acid)


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Just got these. Used to be beautiful coins in someone's collection I am sure. Then the person died and it seems the municipality uses ignorants to clean these apartments and recycle unclaimed goods. The ignorant worker used a file and battery acid to test is the coins were of precious metal. Unbelievably ignorant! Seems he sold most of them to a pond shop.

My question now: how do I clean the stains (I already tried bakeing soda)? 



Some are silver some nickel, our "hero" burned them all.



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