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<p>[QUOTE=&quot;BRandM, post: 1042013, member: 22729&quot;]I use a little Koinsolv and a Q-tip and soft toothpick (gently and carefully). The Koinsolv does most of the work, but the &quot;tools&quot; help loosen the more stubborn gunk. It doesn&#039;t change the color of the coin or harm it in any way. I&#039;ve actually cleaned a couple of coins over the years and sent them to NGC for grading with no problem. I like the product, but only use it occasionally on really dirty coins, mostly to clean out gunk in the counterstamp itself. By the way, Hartzog sells Brunk&#039;s book if you&#039;re interested in getting a copy. He has a limited number to sell and they&#039;re a bit pricey, but well worth it if you have an interest in counterstamps like I do.</p><p>&nbsp;Bruce[/QUOTE]</p><p><br /></p>

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