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<p>[QUOTE=&quot;SuperDave, post: 2815331, member: 1892&quot;]There are occasions - <b>far</b> rarer than tends to get discussed around here - when an appropriate conservation step for a coin is the use of thiourea, a substance which strips the outermost layer of molecules off the surface of a coin and thereby removes something whose removal is in the coin&#039;s best interest, which can&#039;t be removed by a less-invasive process. This process is referred to as &quot;dipping,&quot; although there are those who use the same term in a much more general meaning.</p><p><br /></p><p>Its&#039; use is bandied about <i>way</i> more frequently than the very rare cases when it&#039;s actually the <b>right</b> thing to do, and it is likely the reason why so many &quot;blast white&quot; Morgans are extant more than a century after they were minted. Morgans have been dipped to remove toning by the thousands; more knowledgeable people believe that percentage reaches a <i>majority</i> of Morgans still extant.</p><p><br /></p><p>All the same, it&#039;s my opinion that a <i>very limited</i> justifiable use case does exist for thiourea. And when performing the operation, a pair of tongs is the best way to do it since one&#039;s fingers cover too much of the coin and I&#039;m not really a fan of putting my flesh into something capable of dissolving metal. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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