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<p>[QUOTE=&quot;NSP, post: 2219551, member: 74849&quot;]I believe that when a coin is struck, the metal under the date changes in density (or some other property, I can&#039;t remember). Even if the date is completely gone, that difference below where the date was is still there. Nic-a-date is an acid that reacts more with the metal NOT under the date so the different density metal under the date is left over. This causes the date to show up. I&#039;m sure there&#039;s a more technical explanation, but I think this is the rough gist of it.[/QUOTE]</p><p><br /></p>

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