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<p>[QUOTE=&quot;mikediamond, post: 119267, member: 1859&quot;]This nickel was dissolved in a corrosive substance.&nbsp; These altered coins are called &quot;acid jobs&quot; although it&#039;s not clear whether the fluid is an acid, a strong alkali, or some other corrosive liquid.&nbsp; I&#039;ve heard that concentrated phosphoric acid does a number on copper-nickel and copper-alloy coins.[/QUOTE]</p><p><br /></p>

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