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<p>[QUOTE="Roerbakmix, post: 4027113, member: 100731"]Although both AgCl and AgBr dissolve in ammonium, cupper will also react quickly, making this method unsuitable for bullion coins or fourrée. Although I’ve tried this method a few times, the results were not as favourable as sodium thiousulphate. Generally, the solution should be at a concentration of ca. 5%.</p><p><br /></p><p><br /></p><p><br /></p><p>This sure looks like horn silver. The diagonal line (clean/horn silver) is intriguing. The obverse shows the same line:</p><p>[ATTACH=full]1058706[/ATTACH]</p><p>Maybe it was partly submerged in a cleaning solution? </p><p><br /></p><p>I would (given the appearance of the cleaned part) definitely soak this one in sodium thiousulphate. </p><p><br /></p><p>I've posted this before (it's from my still unfinished guide on restoring horn silver on ancient coins):</p><p>[ATTACH=full]1058707[/ATTACH]</p><p>THis is the same 'patchy' layer of horn silver and the effect of sodium thiosulphate.[/QUOTE]</p><p><br /></p>
[QUOTE="Roerbakmix, post: 4027113, member: 100731"]Although both AgCl and AgBr dissolve in ammonium, cupper will also react quickly, making this method unsuitable for bullion coins or fourrée. Although I’ve tried this method a few times, the results were not as favourable as sodium thiousulphate. Generally, the solution should be at a concentration of ca. 5%. This sure looks like horn silver. The diagonal line (clean/horn silver) is intriguing. The obverse shows the same line: [ATTACH=full]1058706[/ATTACH] Maybe it was partly submerged in a cleaning solution? I would (given the appearance of the cleaned part) definitely soak this one in sodium thiousulphate. I've posted this before (it's from my still unfinished guide on restoring horn silver on ancient coins): [ATTACH=full]1058707[/ATTACH] THis is the same 'patchy' layer of horn silver and the effect of sodium thiosulphate.[/QUOTE]
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