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<p>[QUOTE=&quot;SuperDave, post: 2396670, member: 1892&quot;]It&#039;s an extreme use case, which should be employed after you&#039;ve exhausted plain water as a possibility. That includes long soaks, and freezing/cooling/boiling cycles.</p><p><br /></p><p><b>That</b> process isn&#039;t effective against pure corrosion, just encrustations (stuff that didn&#039;t start life on the coin or part of the coin). It&#039;s up to you to first determine what exactly it is you need to remove, but if it&#039;s so bad you can&#039;t even see a date, then yeah, ultrasonic is in play. The type of damage it&#039;s capable of creating isn&#039;t relevant to coins like that, just coins whose surfaces you&#039;re expecting to end up gradable (or close to it). </p><p><br /></p><p>And obviously not something as soft as gold.[/QUOTE]</p><p><br /></p>

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