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Message:: [QUOTE="BadThad, post: 1090150, member: 17261"]Yes, they lead you to believe, but it's completely untrue. I've been an analytical chemist for 22 years and I, with 100% certainty and knowing the chemical composition of VERDI-GONE, can tell you there's ZERO chance that instrument (or any) could detect that VERDI-GONE had been used on a coin. That product would leave ZERO residual evidence on the surface. It's nothing but show-boating by PCGS....end of story. It's funny to me as an analytical chemist that the person doing the demonstation picked one of the few chemicals that instrument even has the sensitivity to detect. It's also interesting to note the analysis time. It would be impossible for them to do this on every submitted coin. Someone is hand selecting suspect coins for analysis. Personally, I think the coins go to the graders FIRST, they note anything suspect and then send it for analysis.[/QUOTE]