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<p>[QUOTE=&quot;SuperDave, post: 2314000, member: 1892&quot;]Yes. For numismatic use, you&#039;d want one in the higher frequency ranges - 80kHz and up - as they create finer bubbles capable of cleaning tiny interior detail. Temperature is a critical factor, and one has to consider how to suspend the coin without it contacting anything it can bounce off of, without interrupting the cavitation action.</p><p><br /></p><p>No reason why one cannot employ ultrasonic cleaning for more careful/valuable conservation jobs, but it&#039;s definitely expert-level tech in this usage.[/QUOTE]</p><p><br /></p>

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