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<p>[QUOTE=&quot;-jeffB, post: 2936422, member: 27832&quot;]Well-stated.</p><p><br /></p><p>My impression of chemical dipping, though, is that it doesn&#039;t stop at removing sulfur (and dislodging the silver that&#039;s already reacted with sulfur). Everybody says &quot;don&#039;t leave the coin in the dip too long, or you&#039;ll ruin it&quot;; if the dip <i>only</i> attacked silver sulfide, that wouldn&#039;t be an issue. Instead, as I understand it, the dip <i>will</i> slowly attack the coin&#039;s intact surface.</p><p><br /></p><p>With this plasma technique, I&#039;m not sure that that could happen. It&#039;s possible that this technique lets you remove sulfur completely, with no risk to intact metal. That alone could be big. It won&#039;t rescue coins that are too deeply corroded/tarnished/toned, but it shouldn&#039;t endanger coins that <i>are</i> salvageable.</p><p><br /></p><p>And, of course, if your coin has a retained textile strike-through, this is <i>perfect</i> for it... <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie11" alt=":rolleyes:" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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