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<p>[QUOTE=&quot;-jeffB, post: 1074116, member: 27832&quot;]First one: yes, I found and read the thread. I&#039;ve known since my days as a YN that cleaning coins is generally a bad idea, and that you don&#039;t wipe proofs. I started this thread to ask for more specific advice, in a situation where leaving the coins untouched is likely to lead to further deterioration.</p><p><br /></p><p>Second: yes, I found and read the thread. I&#039;m not planning on sending a circulated Kennedy proof or a 1907 IHC to NCS. I understand something about the physics of ultrasonic cleaning and cavitation damage; I don&#039;t think my ultrasonic cleaner is beefy enough to easily cause that kind of damage, but I&#039;d certainly try it on low-value coins first. (If you consider an XF/AU 1907 IHC &quot;higher value&quot; in the first place.)</p><p><br /></p><p>Third: I found this thread soon after I joined the site. I particularly enjoyed the &quot;bleach and ammonia&quot; bit. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /> I see talk about Verdi-Care, but without knowing exactly what chemicals are involved, I&#039;m uneasy about using a product that claims to &quot;permanently bond&quot; to the coin&#039;s surface.</p><p><br /></p><p>Here&#039;s where I&#039;m coming from. I was an avid collector in childhood, decades ago, and I&#039;ve internalized most of the lessons one teaches YNs -- don&#039;t clean, don&#039;t handle by surfaces, etc. I&#039;ve got a pretty strong background in chemistry and general lab technique. I&#039;ve also got some physics background, including handling optics that are considerably more fragile than coin surfaces. I <i>don&#039;t</i> have specific experience conserving coins -- as I said, the lesson I learned early on was &quot;just don&#039;t&quot; -- but as I look at what&#039;s wrong with the examples above, it seems like it would be possible to fix the problems. I&#039;m looking for advice from people who&#039;ve done it successfully. And, even better, from people who&#039;ve attempted it UNsuccessfully. It&#039;s good to learn from your mistakes, but it&#039;s better to learn from other people&#039;s mistakes. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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