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<p>[QUOTE=&quot;Oldhoopster, post: 7497173, member: 84179&quot;]I have had poor results using an ultrasonic.&nbsp; Somebody on CT or CU recently did an ultrasonic experiment and which yielded poor results as well.&nbsp; Don&#039;t forget, the coin can move around in the basket and rub against the hard plastic.</p><p><br /></p><p>If you use an acetone soak, I would make sure the acetone DOES NOT evaporate and you keep it sealed in a dark place (and if it&#039;s sealed and stored in a warmer place, make sure pressure doesn&#039;t build up.&nbsp; Probably not very likely, but something to consider).&nbsp; The (infamous?) Stony Brook University research paper showed that when the acetone is in the presence of light AND evaporates, acetic acid may form on copper surfaces.&nbsp; I prefer using multiple short soaks instead of a long one.[/QUOTE]</p><p><br /></p>

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