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<p>[QUOTE=&quot;Tamaracian, post: 5342934, member: 23122&quot;]You are correct that if you allow the coin to sit on the surface of the Ultrasonic Tank it may result in friction on the Rim (that being the highest profile on a properly struck coin), and if not properly formed during the Upsetting Operation, on some of the highest Relief.&nbsp; Most Ultrasonic Cleaners will come with a Plastic Basket that is perforated to allow the Solution to penetrate and Cavitate around the coin while providing a softer surface than the coin metal so that friction does not occur.&nbsp; Now, putting more than one Coin into the Ultrasonic Cleaner (or its basket) at the same time may result in them moving into each other and even the lighter weight coin(s) moving on top of a heavier coin (as in some Ultrasonic Cleaners, depending upon the level of the liquid and the position of the Coin therein, there is significant movement and &quot;jumping&quot; do to the vibrations imparted by the Basket or Tank Surface and by the Cavitation Bubbles expanding).&nbsp; What I did initially to allow an even penetration of Solution along with maximum Cavitation is to take a woman&#039;s Nylon Stocking--cut along one seam and then opened flat--and make a &quot;Holder&quot; using a wire hanger that follows the interior contour of the ultrasonic Cleaner with 2 &quot;Ears&quot; that lay on top of the Ultrasonic Cleaner&#039;s Opening.&nbsp; The Stocking will stretch downward to allow the Coin to be held by the Edge so that it will not move, and when the cleaning is complete, the Holder is lifted up to remove the Coin.&nbsp; Later on, I purchased a Stainless Basket (from a Lapidary store) that already had a stainless steel mesh strainer attached, which I removed and replaced with the Nylon Stocking.&nbsp; There are commercial solutions from Jewelry and Lapidary stores that are available for general jewelry and gemstone cleaning, but some of these are ACIDIC in nature and I would strongly advise that you investigate the contents before purchasing.&nbsp; A good alternative is to use hot tap water with 1/4 teaspoon of Dawn Dishwashing Liquid, which containing both ionic and non-ionic surfactants, is effective for most organic and non-organic soils.&nbsp; If you have something like tar in crevices of the coin and you wish to effectively loosen--and possibly remove it completely--you can use a solvent such as Acetone or Trichloroethane in a tall glass jar with the Coin resting on the bottom of the Jar, and the Jar resting on the Tank Bottom (Yes, it does work).[/QUOTE]</p><p><br /></p>

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