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<p>[QUOTE=&quot;-jeffB, post: 2213458, member: 27832&quot;]This thread is relevant to my interests. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>[ATTACH=full]432675[/ATTACH] </p><p><br /></p><p>I&#039;ve actually got <i>two</i> thermal cameras, a version-one <a href="http://www.thermal.com/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.thermal.com/" rel="nofollow">SeeK</a> and a <a href="http://www.flir.com/instruments/display/?id=61194" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.flir.com/instruments/display/?id=61194" rel="nofollow">FLIR E4</a> modified to the same sensitivity and resolution as the E8 (320x240).</p><p><br /></p><p>I&#039;ve experimented with them quite a bit, but I haven&#039;t yet come up with the killer app for applying them to numismatics. Coin metals conduct heat well enough that it would be nearly impossible to get a detectable thermal gradient at the fine scale you&#039;re discussing, and you&#039;d need some sort of macro-lens setup to see the fine detail anyhow. (I&#039;ve got that on my to-do list, but it probably won&#039;t happen any time soon.) I thought silver coins in a sealed clad roll <i>might</i> show up as warm bands when heated gently along one side, but I haven&#039;t experimented with that yet, either; the whole &quot;sealed roll&quot; scene doesn&#039;t especially tempt me any more.</p><p><br /></p><p>I&#039;ve wished I still worked at a lab with X-ray microscopy equipment. It seems plausible that X-ray diffraction would reveal a hidden date, possibly even in silver (which doesn&#039;t really reveal dates with chemical etching). That&#039;s not something I&#039;m likely to undertake at home, though. There <i>are</i> hobbyists out there who work with X-ray equipment, but I&#039;m getting a bit too old and cautious for that.[/QUOTE]</p><p><br /></p>

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