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<p>[QUOTE=&quot;-jeffB, post: 8638299, member: 27832&quot;]I know you understand this, but it might be worth clarifying for others: we aren&#039;t talking about any kind of &quot;experimental composition&quot; where blanks were plated with brass instead of copper.</p><p><br /></p><p>If you get a layer of copper over zinc hot enough, even though it&#039;s not hot enough to melt either metal, the zinc <i>diffuses into</i> the copper and <i>turns it into</i> brass (which is an alloy of copper and zinc). From the Mint letter above, this can also happen if too much zinc gets into the plating bath.</p><p><br /></p><p>This migration can happen at any time, before or after the coin is struck. If you see it in a cent that&#039;s just come from a sealed Mint package, you can assume that it happened at the Mint (or at the blank manufacturer, which counts -- I mean, partial planchets have always been considered &quot;mint errors&quot;, even if they happen before the blanks are delivered to the Mint). But if you find one in circulation, I don&#039;t think there&#039;s any way you could prove it&#039;s not PMD.[/QUOTE]</p><p><br /></p>

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