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<p>[QUOTE=&quot;hotwheelsearl, post: 4286225, member: 75143&quot;]Unfortunately acid doesn’t do anything for copper, except dissolve it.</p><p><br /></p><p>It works in nickel-copper alloy for some weird reason that may have to do with some kind of physics of metal flowing under pressure.</p><p><br /></p><p>In other words, acid can only restore the dates on nickel-copper coins[/QUOTE]</p><p><br /></p>

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