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<p>[QUOTE=&quot;Colonialjohn, post: 2091764, member: 57741&quot;]I do find the knowledge of coin cleaning and collectors fascinating on all levels and the built in inhibitions collectors have and rightfully so - recently I created my own Coin Cleaner for copper coins built on flurocarbon technology like the Original Coin Care. Normally if a coin is in Mint State its not a good idea to clean it. From what I can gather based on some information I received the average time spent by a NGC grader on a coin is about 1-2 minutes. I am sure they use stereo microscopes to examine the surface of coins as I currently do but for different purposes - studying contemporary circulating counterfeits. So hairline scratches in a circular pattern is easily identified in some cases if not careful. In either case sulfur and chlorides as indicated in that simplistic William Weimer Coin Chemistry book on why coins tone are the reasons coins tone and I do prefer rainbow coins myself actually rather than BLAST WHITE say on Morgans or late 19thC Federal Red Book types - I would leave it alone. Leave any gold or silver coin alone in Mint State unless there is severe oxidation which is rare in terms of it being unpleasing. There are services. My cleaner was specifically designed to remove thin film copper oxides off of circulated coppers without &quot;any&quot; surface changes to the copper surface. Realize that removing 200 years of copper patina off a coin will have a patina surface appearance change but much better than a green film surface.</p><p><br /></p><p>So in this case leave it alone - submit it ...</p><p><br /></p><p>John Lorenzo</p><p>Numsiamtist</p><p>United States[/QUOTE]</p><p><br /></p>

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