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Message:: [QUOTE="BadThad, post: 518841, member: 17261"]I've never experienced that, but I only use ACS, reagent grade acetone. I only use acetone for drying, I prefer xylene for removing surface debris.   I respectfully disagree, it's all according to the degree of the problem. If done correctly, some problems can be "repaired" with no negative effects. Of course, NCS does this routinely.   That is FACT. The problem is two-fold: 1) most people do not possess the scientific knowledge to approach the problem correctly 2) the common commercial products are FAR TOO HARSH and contain ingredients that damage the metal surface permanently.   Absolultely, verdigris actually REMOVES metal from the surface as it forms the cupric compounds. Copper ions are physically pulled away. However, if the verdigris is not deep, i.e. "pitted in", it can be removed with virtually no trace and no noticable surface damage. It's all about serverity and also type (acetate, chloride, sulfate or carbonate), each one of them has a different degree of difficulty when it comes to removal.  Case in point, my 1909-S VDB which had very light, early stage verdigris. I was able to remove the verdigris with VERDI-GONE™ and pass the NGC grading process. If there was a detectable problem, they would not have graded the coin.....so verdigris CAN be safely removed in some cases.   Indeed again, these products are all EXTREMELY HARSH! IMO, they will do more damage than good![/QUOTE]