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<p>[QUOTE=&quot;benveniste, post: 1495362, member: 25547&quot;]<p style="text-align: left"><span style="color: #000000">I&#039;ve used them for 5 coins:</span></p> <p style="text-align: left"><br /></p> <p style="text-align: left"><span style="color: #000000">1 -- A 1967 10 Lirot Israeli Victory Coin. These were distributed in a PVC-laden plastic holder. This coin had far more sentimental value than monetary value -- it was the last coin given to me by my grandfather. Result: PVC removed, MS67 NGC slab. $36+shipping paid to save a $15 coin.</span></p> <p style="text-align: left"><span style="color: #000000">2 -- A Gettysburg Commemorative. PVC damage again. Result: PVC removed, MS62 NGC slab. Odd note: This coin was returned to me a week before 2 other coins I had sent in the same box to NGC for Economy Service, even though I also paid for Economy Service slabbing on this one.</span></p> <p style="text-align: left"><span style="color: #000000">3 -- An 1875 S/S 20 cent piece. Was in an ANACS AU details NET AU-50 slab. Artificially toned to cover cleaning. I had the AT removed to make it an honest cleaned coin. Result: NGC AU Details, Cleaned Slab.</span></p> <p style="text-align: left"><span style="color: #000000">4 -- An 1851-O NGC AU55 3CS. Originally, I sent this to NGC for a possible regrade or refund, since it appeared that multiple tarnish spots had developed </span>after slabbing. NGC disagreed, so it went off to NCS get it out of the potentially contaminated holder and see if the damage could be fixed. Result: NGC AU55 slab, some remaining toning.</p><p>5 -- A Lafayette Commemorative Dollar, NGC MS63. I was convinced that this coin had been market graded down a step due to unattractive (but natural) toning. I literally spent years dithering on this one -- I bought it in late 2003. Result: NGC MS64 slab.</p><p><br /></p><p>As for how they do it, not to be <u>too</u> cynical, but suffice it to say that the same organization determines what&#039;s &quot;market acceptable&quot; treatment as actually does the treatment.&nbsp; From what I can tell, they mainly use chemical treatments.[/QUOTE]</p><p><br /></p>

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