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<p>[QUOTE=&quot;-jeffB, post: 2902093, member: 27832&quot;]I&#039;m not 100% sure that&#039;s true. I&#039;ve seen a couple of older silver coins (Seated, Barber) that appear to have <i>powdery</i> black toning. I haven&#039;t tried wiping it away, but it looks like a situation where the toning layer is porous, and <i>does</i> allow further attack on the silver underneath. It may just be a matter of harsher environmental conditions...?</p><p><br /></p><p>I&#039;ll see if I can find and photograph an example, but don&#039;t hold your breath. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie11" alt=":rolleyes:" unselectable="on" unselectable="on" /> Busy times around the household...[/QUOTE]</p><p><br /></p>

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