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<p>[QUOTE=&quot;Oldhoopster, post: 3095551, member: 84179&quot;]I&#039;m not familiar with the tinning of Ancients.&nbsp; (I play around the fringes of ancient collecting with no specialization or in depth knowledge).</p><p><br /></p><p>I&#039;m not sure if this will help with the discussion, but Tin metal can undergo a crystal change around 50-60F.&nbsp; This crystal change causes the volume to expand and the piece can eventually crumble.&nbsp; It&#039;s commonly called tin pest.</p><p><br /></p><p><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">https://en.wikipedia.org/wiki/Tin_pest</a></p><p><br /></p><p>I would think that over the course of 1800 years +/-, a tinned surface would be exposed to enough temp variation to initiate the transition.&nbsp; Just my opinion, since I don&#039;t have the experience with these coins, but from the metallurgy side, I think it&#039;s a reasonable explanation against the existence of many tinned ancients.[/QUOTE]</p><p><br /></p>

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