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Why upgrade when you can just clean
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<p>[QUOTE="Roerbakmix, post: 4542171, member: 100731"]Hi [USER=81093]@AussieCollector[/USER], this looks like a combination of dirt and horn silver (the black patina - although it may well be silver sulfide). The dirt can easily be removed, and I guess keeping it immersed in a glass cup of distilled water for a few days will loosen it up.</p><p>In my experience, dirt on silver coins, especially those with a high silver content and a smooth surface (as this coin) are relatively easy to clean. Sometimes just rubbing it with your thumb under a running tap will suffice.</p><p><br /></p><p>Now the black patina is something different. As said, this could well be horn silver (especially on the reverse the texture of the patina is a bit grainy). I would not clean it, as I expect pitting on the reverse - although a very short immersion in sodium thiosulphide may make the reverse a bit more smooth. But as said, I would probably stay away.</p><p><br /></p><p>Also, a few more cleaning projects:</p><p>[ATTACH=full]1124419[/ATTACH]</p><p>[ATTACH=full]1124420[/ATTACH]</p><p>[ATTACH=full]1124421[/ATTACH]</p><p>[ATTACH=full]1124422[/ATTACH][/QUOTE]</p><p><br /></p>
[QUOTE="Roerbakmix, post: 4542171, member: 100731"]Hi [USER=81093]@AussieCollector[/USER], this looks like a combination of dirt and horn silver (the black patina - although it may well be silver sulfide). The dirt can easily be removed, and I guess keeping it immersed in a glass cup of distilled water for a few days will loosen it up. In my experience, dirt on silver coins, especially those with a high silver content and a smooth surface (as this coin) are relatively easy to clean. Sometimes just rubbing it with your thumb under a running tap will suffice. Now the black patina is something different. As said, this could well be horn silver (especially on the reverse the texture of the patina is a bit grainy). I would not clean it, as I expect pitting on the reverse - although a very short immersion in sodium thiosulphide may make the reverse a bit more smooth. But as said, I would probably stay away. Also, a few more cleaning projects: [ATTACH=full]1124419[/ATTACH] [ATTACH=full]1124420[/ATTACH] [ATTACH=full]1124421[/ATTACH] [ATTACH=full]1124422[/ATTACH][/QUOTE]
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Why upgrade when you can just clean
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