If the right acid were used. Some types remove just the copper, and others remove the silver. Which one, I don't know. But they have been doing this for years now, mainly on cents to reduce them to dime size to use in vending machines. Back in the 50-60's they would take a cent and make it dime sized and then get a soda for ten cents. On the 7oz bottles you could get one for 7 cents. Then you would get Three Cents back in change and you had money to make more "Pop Money."
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