Bring some chips cause I brought the dip.

There are those here who would disagree, but from my side, acetone might result in spotting appearing, if there is already contamination on the metal which is dissolved in pure acetone and not completely "washed off". So if there was a small film of organic material on the coin, it could dissolve in the acetone, and as the acetone itself evaporated, condense into a spot. It is not the fault of the acetone, as much as insufficient rinsing. Since it is my supposition that water affects the metal more than acetone, I use a distilled water rinse followed by an acetone rinsing, rather than the reverse as acetone evaporates faster, and will carry any remaining water with it. I always hesitate and evaluate before using it with a proof coin, as the contaminant layer may be invisible to the eye, but show up if incompletely rinsed and not held vertical in drying. My opinion, your mileage may vary as they say.

Jim

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Don't want to hijack the OP thread

However after reading the article again another thing occur to me, it appear they are only going to use the coin sniffer on PCGS Secure Plus™ submissions and not on PCGS standard submissions. If so, this would greatly increase the market for their PCGS Secure Plus service.