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<p>[QUOTE=&quot;Kentucky, post: 1688034, member: 33176&quot;]I have read about that technique, and asked about it here on CT.&nbsp; The consensus at that time is that the thermal shock might crack the coin.&nbsp; After thinking about it, I have to agree.&nbsp; The idea is that the metal will contract and expand more than any crud coating it, and thus will crack the crud off.&nbsp; Metals will crystalize over a long period of time, and this would make them more prone to cracking.&nbsp; I don&#039;t think I would do it.[/QUOTE]</p><p><br /></p>

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