I have a few Buffalo nickels with grey-black toning...the detail of the coins are EF or better...is there a dip for nickels to restore these coins to their silvery natural color? (none of these is a rare date)
atlashealth- Is it possible that the coins were in a fire? I have seen many with fire damage that had no real damage(no bubbling of the surfaces & etc) other than the black surface.
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