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<p>[QUOTE=&quot;davidh, post: 1188897, member: 15062&quot;]If you mean chemical jewelery cleaner, it probably wouldn&#039;t hurt the gold.&nbsp; There are no over-the-counter chemical cleaners that will react with gold.&nbsp; If the cleaner is acidic, then there could be some reaction with the copper in the coin, leaving pits and/or spots.</p><p><br /></p><p>On the other hand, if you mean an ultrasonic cleaner, it (the cleaner) would likely have burned itself out long before three weeks of continuous use.&nbsp; The possibility of damage to the coin relates to the method it uses to clean.&nbsp; The ultrasonic sound pulses cause microscopic gas bubbles to form on the surface of what is being cleaned.&nbsp; These bubbles instantly break down and in the process produce a shock wave which blasts loose any dirt.&nbsp; They also can damage the metal in the same process (look up Cavitation) resulting in a pitted surface.[/QUOTE]</p><p><br /></p>

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