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<p>[QUOTE=&quot;-jeffB, post: 8401428, member: 27832&quot;]Yup, there isn&#039;t any copper &quot;inside&quot; to get &quot;exposed&quot; in a nickel, it&#039;s 75% copper/25% nickel all the way through when it&#039;s struck.</p><p><br /></p><p>Nickel is a more <i>reactive</i> metal than copper (sort of, it&#039;s complicated), so corrosion tends to leach away the nickel, leaving the copper behind. Those corroded spots look like copper, because they <i>are</i>, mostly. But it&#039;s not any sort of mint error -- just damage.[/QUOTE]</p><p><br /></p>

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