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Message:: [QUOTE="Insider, post: 2688572, member: 24314"]This is what I have learned:  Ultrasonic cleaners are dangerous...LOL.  They must be used properly.  The reason they are used for conservation is the chemicals reach deeper into the microscopic surface of the coin.  Additionally, for the same reason, chemicals used to neutralize the coins do a better job.   1. Nothing can touch the coin except holding it in tongs. Any type of "basket" (including nylon) that can rub on the coin will eventually affect the surface (rub).2. Heat helps, but these cleaners are more expensive.3. Coin must be watched and agitated at all times to prevent the microscopic bubbles from digging a hole into the surface.    Seattlite86, posted: "Can they restore coins that have been ruined by improper dipping?"  No, but in cases of "dip burn" it can be lightened. "Is this focused specifically on proofs, or does it venture further?"  It is just conservation of any coin.  So far, major stains on SE cannot be removed but I should think someone must be working on it. "Does it favor any specific metals?"  Again, conservation is different for different metals.  They do different things with gold than they do with silver, nickel, or copper.  "Did they give out any word on the cost of conservation and how to submit coins?" No, AFAIK three of the major TPGS charge for conservation.  Call each for details.  At this time, IGC does not.  That's where this demonstration took place.[/QUOTE]