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<p>[QUOTE=&quot;Dot, post: 159483, member: 6394&quot;]Came across a nice new unit at a thrift store for a couple bucks, so of course I picked it up, thinking it could be useful for something.&nbsp; Now, I know the dogma about not cleaning coins... but there are some that I want to experiment on anyway.&nbsp; I&#039;m in an experimental mode, I&#039;m trying to learn how to detect various insults to coins, and figure that the best way is to do them myself.&nbsp; </p><p><br /></p><p>In particular I have one coin, a 1933 Walker, not valuable but a nice coin anyway, and it&#039;s got some sort of organic gunk on it (it smells organic, like someone either tried to tone or clean it, unsuccessfully).&nbsp; </p><p><br /></p><p>How would ultrasonic cleaning impact a coin, I mean negatively?&nbsp; And, I was thinking of putting all my really old grungy icky coins from rolls (cents mostly) into it just to clean them before putting them back into circulation.</p><p><br /></p><p>What do you say?[/QUOTE]</p><p><br /></p>

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