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<p>[QUOTE=&quot;desertgem, post: 545247, member: 15199&quot;]Actually we have had threads about the ultrasonic cleaning. I also mentioned it earlier in this thread, but dealing with gemstones. If a coin was <b>just exposed to the ultrasound</b>&nbsp; ( not considering the liquid) of a commercial jewelry type unit, no harm would occur ( Don&#039;t stop here, please read all). Commercial Ultrasonic Descalers (non dental) could remove details from the coins with the sound waves, but I doubt many collectors have one in their garage or even back of the coin store <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie8" alt=":D" unselectable="on" unselectable="on" />&nbsp; &nbsp;&nbsp; BUT...</p><p><br /></p><p>the<b> problems</b> are </p><p><br /></p><p>1. If the coin is resting in a basket ( whether plastic or stainless steel, rubbing will occur and the results will be deleterious and visible.</p><p><br /></p><p>2. The fluid used to conduct the ultrasound are usually chemical cleaners, and the effects of those on the coin are indeterminal but not likely to be safe.</p><p><br /></p><p>( PLEASE do not think about using acetone or any volatile chemical that could go BooM) someone actually suggested that on another site.</p><p><br /></p><p>3. If you are a dentist, I would be interested if you could try your hand unit on a couple of pocket coins. Take before and after photos please.</p><p><br /></p><p>So currently I would say I would <b>not</b> use a ultrasonic cleaner on coins and I have one.<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie9" alt=":eek:" unselectable="on" unselectable="on" /></p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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