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<p>[QUOTE=&quot;BadThad, post: 3743189, member: 17261&quot;]ATR will GREATLY attenuate the signal to the detector in FTIR diminishing the sensitivity....usually by orders of magnitude. With lab ATR, we use mirrors and diamond to reflect the signal and it weakens it. The PCGS &quot;Sniffer&quot; is a cobbled together system with even LOWER sensitivity than a true lab instrument due to having to reflect the incident beam off the coin. It is not near sensitive enough to pick-up a thin layer of VC on the surface.[/QUOTE]</p><p><br /></p>

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