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<p>[QUOTE=&quot;desertgem, post: 1039011, member: 15199&quot;]<p style="text-align: left"><span style="color: #000000">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 &quot;washed off&quot;. 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.</span></p> <p style="text-align: left"><span style="color: #000000"><br /></span></p> <p style="text-align: left"><span style="color: #000000">Jim </span></p> <p style="text-align: left"><span style="color: #000000"><br /></span></p> <p style="text-align: left"><span style="color: #000000"><br /></span></p><p>[/QUOTE]</p><p><br /></p>

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