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<p>[QUOTE=&quot;Roerbakmix, post: 4023865, member: 100731&quot;]Thanks [USER=56859]@TIF[/USER] for the compliment <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" /></p><p><br /></p><p>I agree with above: this looks like horn silver (search on CT for my previous post on Horn Silver for more information on it). I would be very hesitant to clean it for two reasons:</p><p>1) it looks like it was cleaned before, with some unfavorable results (mainly on the obverse). Horn silver, in my experience, comes in different forms. This type, the diffuse granular type, is difficult to treat. My hypothesis is that the horn silver in these cases is caused by corrosion of the coin itself (in contrast to horn silver deposits from other coins, e.g. as can be found in coin hoards). The corrosion is often masked by a layer of horn silver, but becomes visible when the horn silver is dissolved. </p><p>2) the metal on the obverse shows signs of this corrosion, and cleaning the whole coin will probably worsen the appearance. </p><p><br /></p><p>However, the reverse shows solid and good silver, and would probably improve. I would try to do the following:</p><p>1) create a strong solution of sodium thiosulphate in distilled water (e.g. 10 grams/50 ml)</p><p>2) heat this until cooking point</p><p>3) on the reverse, apply a few drops in an area with a thin layer of horn silver (e.g. near the &quot;LKB&quot; legend. </p><p>4) wait a few minutes, remove the solution, and repeat. </p><p>5) after 10-15 minutes, throw away the solution, and make a new solution. Sodium thiosulphate degenerates over time into, among others, sulfur, which can result in a yellow-grey patina. </p><p><br /></p><p>I expect the horn silver to change appearance (it changes colour, becomes yellow, and a bit translucent) and then dissolve. The smooth metal on the reverse is a good sign. </p><p><br /></p><p>Hope this helps! Feel free to pm me.[/QUOTE]</p><p><br /></p>

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