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<p>[QUOTE=&quot;calcol, post: 3744143, member: 77639&quot;]I&nbsp; had a coin (nice AR commem) that was treated with Dissolve (freon 113, no longer available), which should remove PVC residue.&nbsp; It was submitted with the Secure option and came back in a body bag labeled PVC residue.&nbsp;&nbsp; It looked clean; so I figured the sniffer detected something.&nbsp; Just in case, I treated it again.&nbsp; Then sent it back w/o the Secure option.&nbsp; Sure enough, it straight-graded with no problem.</p><p><br /></p><p>Lesson here it that if a coin is submitted to PCGS with the Secure option and is rejected for PVC or other surface contamination, then 1. treat with acetone, THF, Dissolve or Koinsolv (these are all harmless-to-metal solvents), 2. give it a close look,&nbsp; 3. if it looks clean, consider resubmitting w/o the Secure option.</p><p><br /></p><p>Interesting to learn the sniffer is FTIR in reflectance mode.&nbsp; From the name, I wrongly assumed it was GCMS.&nbsp; Should be called &quot;the looker&quot;.</p><p><br /></p><p>I wonder if a coin treated with Verdicare and then treated with acetone would lose the residue left by Verdicare and escape notice by the sniffer.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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