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<p>[QUOTE=&quot;loei88, post: 3481, member: 593&quot;]Hi all,</p><p><br /></p><p>I have been using ultrasonic machine to clean my oriental trade dollars (not the US trade$s specifically, but ones circulating in Asia in the late 1800s to early 1900s) and so far I have not noticed any bad side effects from it. Mostly the dirt came off from the coin. The coin is immersed in distilled water and is held in a bandage roll while in the cleaner. The cleaner I am using is the one used in the jewelry industry.</p><p><br /></p><p>Just my experience with cleaning coins.</p><p><br /></p><p>Lawrence[/QUOTE]</p><p><br /></p>

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