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<p>[QUOTE=&quot;-jeffB, post: 4085789, member: 27832&quot;]See, that&#039;s <i>not</i> true, though. Annealing metal definitely causes atoms to migrate. Cold working might or might not, I don&#039;t know (one of the many parts of metallurgy I don&#039;t know). Is it enough to cause macroscopic impurities to migrate during the normal processing of coin metal? No idea, but I don&#039;t think we can rule it out.</p><p><br /></p><p>(I started down a rabbit hole a bit with this. I remembered <a href="https://en.wikipedia.org/wiki/Tin_pest" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Tin_pest" rel="nofollow">tin pest</a>, which may or may not be relevant, and <a href="https://en.wikipedia.org/wiki/Electromigration" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Electromigration" rel="nofollow">electromigration</a>, which almost certainly isn&#039;t...)</p><p><br /></p><p><br /></p><p><br /></p><p>Again, I&#039;m not convinced it&#039;s that simple. There are materials that can migrate into bulk metal, and no dip will ever fix that. Think about getting mercury on gold. (I sure <i>hope</i> there&#039;s no mercury in the Mint&#039;s processes, but there are other materials that can behave similarly.)[/QUOTE]</p><p><br /></p>

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