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<p>[QUOTE=&quot;predcarn, post: 152976, member: 6000&quot;]I had never heard of steam cleaning coins. Ultrasonic&nbsp; cleaning, yes, but</p><p>not steam cleaning, especially copper containing coins. I did check on one</p><p>by Salton to see what it said and it said it cleans by steam and electro-</p><p>chemical action. Both might be Ok for gold or gemstones, but not for</p><p>copper which is so reactive with water. Electrochemical is another word for a</p><p>process that can change metal surfaces, I guess they are saying to</p><p>remove the tarnish <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie3" alt=":(" unselectable="on" unselectable="on" />&nbsp; or surface metal. Gold could take this process, but</p><p>silver and copper would be reactive depending on the time. </p><p><br /></p><p>An ultrasonic cleaner seems about the same price, and you can use </p><p>several different solutions that are &quot;safe&quot; for coins. And the microscopic</p><p>bubbles cleans very effectively without damaging the surface as I under</p><p>stand the process. JMO.[/QUOTE]</p><p><br /></p>

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