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<p>[QUOTE=&quot;-jeffB, post: 3795640, member: 27832&quot;]I would expect that throwing a bunch of coins <i>together</i> into an ultrasonic cleaner would damage them. Their contact points would be vibrating furiously; I&#039;d expect lots of scuffs. Putting a single coin in a metal wire basket would likely do the same thing.</p><p><br /></p><p>I <b>doubt</b> that a &quot;jewelry cleaner&quot;-class ultrasonic cleaner would cavitate strongly enough to knock metal loose from an intact surface. If it did, it wouldn&#039;t be super-great for cleaning <i>jewelry</i>, would it? (Maybe I&#039;m wrong; we certainly do lots of <i>other</i> things to jewelry that we wouldn&#039;t do to coins.)</p><p><br /></p><p>I <b>think</b> that cleaning a single coin in a consumer-grade ultrasonic cleaner (not a high-powered industrial cleaner), suspending it in a fabric net, probably wouldn&#039;t cause new damage to its surface. But I haven&#039;t experimented yet, so I wouldn&#039;t tell anyone else to risk a valuable coin doing it. [USER=24314]@Insider[/USER] likely has actual data. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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