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<p>[QUOTE=&quot;guy, post: 15108, member: 947&quot;]i heard that you could use ultrasound here is what someone said on <a href="http://www.predecimal.com/forum/index.php?act=ST&amp;f=17&amp;t=629&amp;" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.predecimal.com/forum/index.php?act=ST&amp;f=17&amp;t=629&amp;" rel="nofollow">http://www.predecimal.com/forum/index.php?act=ST&amp;f=17&amp;t=629&amp;</a></p><p><br /></p><p>QUOTE &quot;A friend of mine who&#039;s a doctor is just starting to take an interest in collecting. I was giving him all the usual advice about not cleaning coins in any way when he asked &quot;what about ultrasound?&quot;</p><p><br /></p><p>For my enlightenment he explained that ultrasound cleaning involves putting an object into water, pure and simple, and using ultrasound waves to agitate the water molecules to a point where the action of the water alone acts as a cleaning agent.</p><p><br /></p><p>Apparently it works a treat for oboe reeds - but what about coins? It appears there&#039;s no other tangible agent present except the water - and who hasn&#039;t used a drop of that to remove surface dirt? Has anyone else had experience of ultrasound in this context or any advice as to how safe it may or not be?&quot;[/QUOTE]</p><p><br /></p>

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