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Message:: [QUOTE="imrich, post: 2360647, member: 22331"]Kudos for your objective discussion of one of numerous "processes" that will reverse the oxidizing/sulphating et al environmental degradation conditions. Because of various factors, including surface tension, "dips" can't normally achieve the results of this process in conjunction with other "proprietary" processes. I believe commercial endeavors as NCS/ANACS/PCGS "conservation/restoration" (i.e. "cleaning") services apply same/similar processes for a fee, to facilitate an acceptable grade. These services, I believe, don't disclose their processes to facilitate greater earnings. These processes aren't "nuclear science". I personally have examined "conservative/restorative" processes for many years, and as part of a multi-year "top-tier" TPG evaluatory process, similar to that reported in the 5/26/03 issue of Coin World, we have clandestinely submitted thru established high volume dealers, believed properly "conserved/restored" scarce date coins to receive appreciably more valuable grading. Several of the coins were previously submitted to these firms in their "bottom tier" TPG slabs (e.g. ACG), being returned with derogatory comments concerning being unfit for grading. I believe that current grading is a function of potential market value rather than actual coin condition and adherence to established published standards. It's believed the "top tier" TPG have established by their practices/services that "non-destructive" cleaning is acceptable. I believe that many neophyte collectors appreciate your learned practical post. Thanks for sharing your experience!! JMHO[/QUOTE]

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