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<p>[QUOTE="-jeffB, post: 4085789, member: 27832"]See, that's <i>not</i> true, though. Annealing metal definitely causes atoms to migrate. Cold working might or might not, I don't know (one of the many parts of metallurgy I don't know). Is it enough to cause macroscopic impurities to migrate during the normal processing of coin metal? No idea, but I don'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't...)</p><p><br /></p><p><br /></p><p><br /></p><p>Again, I'm not convinced it'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's no mercury in the Mint's processes, but there are other materials that can behave similarly.)[/QUOTE]</p><p><br /></p>
[QUOTE="-jeffB, post: 4085789, member: 27832"]See, that's [I]not[/I] true, though. Annealing metal definitely causes atoms to migrate. Cold working might or might not, I don't know (one of the many parts of metallurgy I don't know). Is it enough to cause macroscopic impurities to migrate during the normal processing of coin metal? No idea, but I don't think we can rule it out. (I started down a rabbit hole a bit with this. I remembered [URL='https://en.wikipedia.org/wiki/Tin_pest']tin pest[/URL], which may or may not be relevant, and [URL='https://en.wikipedia.org/wiki/Electromigration']electromigration[/URL], which almost certainly isn't...) Again, I'm not convinced it'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's no mercury in the Mint's processes, but there are other materials that can behave similarly.)[/QUOTE]
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