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<p>[QUOTE=&quot;desertgem, post: 1603731, member: 15199&quot;]It is not a big secret, it is just a bad technique. If you can devise a way to <b>suspend</b> the coin in the solution while using the ultrasound, it might work, but the coin will either rest in a plastic carrier or a metal container, and either one can put scratches or marks on a coin ( particularly a copper or silver one) as the coin will vibrate also.</p><p><br /></p><p>Also the reason jewelers can use it , is that it is Ok for them to polish any marks out, whereas polishing is not for coins.[/QUOTE]</p><p><br /></p>

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