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<p>[QUOTE=&quot;BadThad, post: 8195880, member: 17261&quot;]From what I&#039;ve seen and understand as an analytical chemist the sniffer is an FTIR-ATR type of instrument. This technique is not very sensitive and a thin layer of VC should not be detectable. I&#039;ve verified this myself in the lab using a REAL FTIR-ATR that is much more sensitive than their instrument. The sniffer is not routinely used at PCGS unless you pay for that service level or the coin is valuable enough they want to verify anything suspicious the graders may see. </p><p><br /></p><p>I have received notes from many different collectors over the years that have used VC on coins and they came back slabbed.&nbsp; Of course, any conservation is tricky and I cannot guarantee a coin will pass through any grading company after conservation no matter how it was done. If you decide to &quot;tinker&quot; with any coin, you&#039;re on your own as far as the TPGs. For those that know me, I generally recommend NOT messing with your coins. Personally, I don&#039;t mind a little bit of non-damaging crust on coins, it demonstrates it&#039;s originality![/QUOTE]</p><p><br /></p>

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