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<p>[QUOTE=&quot;Kentucky, post: 2313953, member: 33176&quot;]From what I have seen, ultrasonic cleaners will STRIP the surface, not of verdigris or any other corrosion damage, but definitely of dirty stuff.&nbsp; The problem is that it can leave a granular appearing surface on older/worn coins.&nbsp; For Uncirculated or Proof coins, as long as there is nothing for them to bump into, it would probably be OK.&nbsp; Like others said, try it on coins you don&#039;t care much about at first.[/QUOTE]</p><p><br /></p>

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