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<p>[QUOTE=&quot;Insider, post: 5377651, member: 24314&quot;]Colonialjohn, posted: &quot;I developed a cleaning process and would welcome some challenge coins. LOL However, I do ask for a photo as you can not obviously REVERSE surface corrosion or sulfide spots. <span style="color: rgb(179, 0, 0)">Recently incorporated ultrasonic cleaning</span> into the MIX. The easist way is for GDJMSP to send me five $10 coins. He can then post BEFORE/AFTER photos. Then we can stop this merry-go-round …&quot;&nbsp; <span style="color: #ff4d4d">edited</span></p><p><br /></p><p>In the 1980&#039;s, I visited a &quot;boiler factory&quot; that was part of a Federal Court case.&nbsp; They were accused of selling over graded coins.&nbsp; They had a room with two ultrasonic machines and EVERY Morgan dollar was dipped using them.&nbsp; That&#039;s where I first learned the difference between the pro&#039;s and the rest of us.</p><p><br /></p><p>It should be obvious to anyone <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" /> that chemicals can reach deeper and quicker into a coin&#039;s surface using an ultrasonic bath. They are also neutralized better.&nbsp; A large Branson 4 beaker, heated ultrasonic cleaner was one of the first things we ordered at the first TPGS conservation division.&nbsp; I use a newer model at ICG&#039;s conservation servace.[/QUOTE]</p><p><br /></p>

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