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<p>[QUOTE=&quot;Roerbakmix, post: 4790533, member: 100731&quot;]Basically, horn silver can form on any silver coin, if exposed to high concentrations of Chloride or Bromium (AgCl or AgBr) for a sufficient period of time. I&#039;ve seen it on medieval coins (this is the same type of HS as the coin of OP):</p><p>[ATTACH=full]1164215[/ATTACH] [ATTACH=full]1164214[/ATTACH]</p><p><br /></p><p>... Roman (this is the metallic type):</p><p>[ATTACH=full]1164216[/ATTACH] [ATTACH=full]1164217[/ATTACH]</p><p><br /></p><p>[ATTACH=full]1164220[/ATTACH]</p><p>[ATTACH=full]1164221[/ATTACH]</p><p><br /></p><p>Greek (still have to clean this one):</p><p>[ATTACH=full]1164222[/ATTACH]</p><p><br /></p><p>... Carolingian (didn&#039;t clean it, as it was too unstable):</p><p>[ATTACH=full]1164223[/ATTACH]</p><p>... Anglo-Saxon (again the metallic type):</p><p>[ATTACH=full]1164224[/ATTACH]</p><p><br /></p><p>etc.</p><p><br /></p><p>Restoration of horn silver can be lucrative, if you know what you&#039;re doing. Uncleaned coins usually sell for way lower prices.[/QUOTE]</p><p><br /></p>

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