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<p>[QUOTE=&quot;GDJMSP, post: 3835372, member: 112&quot;]I agree with your comments, there will be no damage to the coin as a result of you holding the edges with your fingers (or plastic tongs), from your fingers or tongs, while it&#039;s in the cleaner. Assuming it&#039;s only for a very short time frame.</p><p><br /></p><p><br /></p><p><br /></p><p>The fluid itself, yes there can be damage from that because of the velocity of the fluid molecules . And to make it worse, all the particles that come off the coin, will be for all intents and purposes grinding against the coin in a manner similar to sandblasting.</p><p><br /></p><p>You, or anybody, can easily test this yourself. Take a coin that is fully lustrous, no contamination on it that you can see. Hold it with plastic tongs in the cleaner, keep it there for 15 minutes or so. Then take it out and look at it - the luster will be gone. And if you could leave it in there long enough, it would even eat the details right off the surface of the coin.</p><p><br /></p><p>I suppose most folks aren&#039;t aware of it but water itself is abrasive, at sufficient speed. There is even an industrial machine that cuts through cylinders of chrome steel 3 feet in diameter in seconds, and it does it with a thin jet of water, nothing but plain water. It cuts right through that steel like a hot knife through butter. And the reason it works is because the water is under enough pressure to produce sufficient velocity for it to do this.</p><p><br /></p><p>This is why ultrasonic cleaners work to clean things. It&#039;s because the molecules of the fluid reach sufficient velocity from the vibration to eat away contaminants from the surface. It&#039;s the same basic principle the cutting machine uses, make the water or fluid move fast enough and it&#039;ll cut metal.[/QUOTE]</p><p><br /></p>

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