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<p>[QUOTE=&quot;tartanhill, post: 4903706, member: 93472&quot;]Anyone have a guess as to what caused the damage on the surface of this coin?</p><p><br /></p><p><img src="https://www.numisbids.com/sales/hosted/artcoinsroma/e92/image00034.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p>My thought is that it was covered in AgCl/horn silver at one time and was treated with sodium thiosulphate to remove it.&nbsp; There have been several discussions here on CT about this treatment.&nbsp; I have also seen some other coins offered in auctions that mentioned in their descriptions some damage from horn silver.&nbsp; Is it possible this coin was so thoroughly covered in horn silver that when it was treated, a large part of the silver was removed because it was in combination with the AgCl?</p><p>I would be interested in hearing from some of you who have used sodium thiosulphate in treating horn silver as to whether you have had damage like this as a result.&nbsp; If this is not the cause of the coin&#039;s damage, what do you think it is?[/QUOTE]</p><p><br /></p>

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