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<p>[QUOTE=&quot;beerandchips, post: 3795046, member: 102191&quot;]I believe that is would damage the surface of a coin.&nbsp; Here is something I found while researching the subject. &quot;Note: High power ultrasonic cavitation can fracture the surface of brittle materials and micro-roughen the surface of ductile materials.&quot;&nbsp; It is from Donald M. Mattox, in <a href="https://www.sciencedirect.com/book/9780815520375" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.sciencedirect.com/book/9780815520375" rel="nofollow">Handbook of Physical Vapor Deposition (PVD) Processing (Second Edition)</a>, 2010.</p><p><br /></p><p>The action of the bubbles and cleaning fluid on the coin and the material removed from the coin re-impacting it can lead to changes in the surface of the coin.</p><p><br /></p><p>So, to answer your question with a question: Does a change in the surface of a coin change the value of a coin?[/QUOTE]</p><p><br /></p>

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