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<p>[QUOTE=&quot;robinjojo, post: 8198094, member: 110226&quot;]Sodium thiosulfate pentahydrate, when dissolved in heated distilled water, is a very effective method to remove horn silver, without needing to resort to any mechanical tools, except for some toothpick perhaps.</p><p><br /></p><p>The problem with removing horn silver is that there is a very good chance that rough, porous surfaces rest underneath.&nbsp; Stripping away the horn silver is also removing some of a coin&#039;s detail.&nbsp; This is due to the surface of the coin, over thousands of years, reacting and alternating due to environmental factors, such as oxygen, water and any other chemicals in the soil, or other surrounding coins or objects.</p><p><br /></p><p>The result is often a rough, mushy appearance.&nbsp; That&#039;s why it is generally best to leave coins with dark &quot;hoard&quot; patina alone.&nbsp; Any intervention will likely have a negative impact.</p><p><br /></p><p>Here&#039;s a rare, imitation of an Athenian new style tetradrachm.&nbsp; This coin has a very dark surface that some might call horn silver, others hoard patina, but no matter what term is used, any attempt to remove it would be a disaster!</p><p><br /></p><p>[ATTACH=full]1436227[/ATTACH][/QUOTE]</p><p><br /></p>

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