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<p>[QUOTE=&quot;IdesOfMarch01, post: 2825087, member: 39084&quot;]The post that you cite describes the action known as bronze disease, described on Wikipedia: <a href="https://en.wikipedia.org/wiki/Bronze_disease" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Bronze_disease" rel="nofollow">https://en.wikipedia.org/wiki/Bronze_disease</a></p><p><br /></p><p>When I look at the chemical reactions involved, it appears that four Cl (chlorine) atoms are required to form one cupric chloride/cupric hydroxide compound plus two HCl molecules.&nbsp; This means that two of the original four Cl atoms are used up, so eventually the reaction will run out of Cl atoms and stop.&nbsp; (Any chemist here, please confirm.)</p><p><br /></p><p>In bronze disease, the Cl atoms are very difficult to eliminate since they&#039;re usually protected by encrustations, and that&#039;s why bronze disease is so insidious.&nbsp; But if your ancient AE coin doesn&#039;t have bronze disease and has any sort of patina, the amount of NaCl transferred from your fingers to be in contact with the Cu atoms of the coin is tiny and would be unlikely to result in any consequential degradation of the coin.&nbsp; (Again, any chemists here should verify or refute my logic.)[/QUOTE]</p><p><br /></p>

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