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<p>[QUOTE="TIF, post: 2510821, member: 56859"]Horn silver is silver chloride (AgCl). On ancient silver coins, it is sometimes seen as a dull gray or black tenacious deposit. I'm unaware of any easy way to remove it without harming the underlying surface, although I have seen sodium thiosulfate recommended as a removal agent (soak the coin in a solution of sodium thiosulfate).</p><p><br /></p><p>This Ptolemy I tetradrachm has what I believe is a scattering of horn silver (the rough stuff on the surface). On this coin it's not terribly distracting and the coin was not inexpensive so I'm not going to try to remove it.</p><p><br /></p><p>[ATTACH=full]1270105[/ATTACH] </p><p><br /></p><p><b>EGYPT. Ptolemy I Soter</b></p><p>AR tetradrachm, 27 mm, 17.0 gm (Attic standard)</p><p>Alexandreia mint, struck 313/12 BCE</p><p>Obv: Head of the deified Alexander III to right, wearing mitra of Dionysos and elephant skin headdress, with aegis around his neck, and with horn of Ammon on his forehead</p><p>Rev: ΑΛΕΞΑΝΔΡΟΥ; Athena Alkidemos advancing right, hurling spear with her right hand and with shield over her extended left arm; to right, eagle with closed wings standing on thunderbolt to right with ΔΙ below</p><p>Ref: Svoronos 33; Zervos series D, issue XIII; SNG Copenhagen 14; BMC 7[/QUOTE]</p><p><br /></p>
[QUOTE="TIF, post: 2510821, member: 56859"]Horn silver is silver chloride (AgCl). On ancient silver coins, it is sometimes seen as a dull gray or black tenacious deposit. I'm unaware of any easy way to remove it without harming the underlying surface, although I have seen sodium thiosulfate recommended as a removal agent (soak the coin in a solution of sodium thiosulfate). This Ptolemy I tetradrachm has what I believe is a scattering of horn silver (the rough stuff on the surface). On this coin it's not terribly distracting and the coin was not inexpensive so I'm not going to try to remove it. [ATTACH=full]1270105[/ATTACH] [B]EGYPT. Ptolemy I Soter[/B] AR tetradrachm, 27 mm, 17.0 gm (Attic standard) Alexandreia mint, struck 313/12 BCE Obv: Head of the deified Alexander III to right, wearing mitra of Dionysos and elephant skin headdress, with aegis around his neck, and with horn of Ammon on his forehead Rev: ΑΛΕΞΑΝΔΡΟΥ; Athena Alkidemos advancing right, hurling spear with her right hand and with shield over her extended left arm; to right, eagle with closed wings standing on thunderbolt to right with ΔΙ below Ref: Svoronos 33; Zervos series D, issue XIII; SNG Copenhagen 14; BMC 7[/QUOTE]
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