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<p>[QUOTE=&quot;John Anthony, post: 2205880, member: 42773&quot;]Tarnish is another type of salt, AgS, which forms on silver coins when they&#039;re exposed to sulfur. It&#039;s very easy to tell the difference between tarnish and horn silver because tarnish is only a few molecules thin, and the coin&#039;s surfaces still look smooth, even when the tarnish has gone to black. Horn silver manifests itself as encrustations that make the surface very rough. I don&#039;t have any coins with horn silver in my collection, but I did come across this image on the web...&#039;</p><p><br /></p><p>[ATTACH=full]430327[/ATTACH] </p><p><br /></p><p>That&#039;s a pretty bad case, and it should answer your question as to whether the coin is devalued by having horn silver deposits. The answer is always yes, but the extent of the devaluation depends on the amount of horn silver and the buyer.[/QUOTE]</p><p><br /></p>

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