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<p>[QUOTE=&quot;robinjojo, post: 7963703, member: 110226&quot;]I used primarily sodium thiosulfate/thiosulphate (pentahydrate) 99% pure, mixed with distilled water and heated in my 750 watt microwave for about 40 seconds.&nbsp; I then stir the solution to make sure the tablets are totally dissolved.&nbsp; For this coin I applied the solution on the affected area with cotton swabs.&nbsp; I went through a lot of those.&nbsp; I would pause the removal and assess the coin for a day or two, and then resume until the process reaches the point that is acceptable for me: not total removal, with enough horn silver to provide some contrast as befits an ancient coin.&nbsp; </p><p><br /></p><p>The solution did remove deposits in other areas, which wasn&#039;t my intention, but the coin will tone down over time.</p><p><br /></p><p>Using sodium thiosulfate/thiosulphate has been a revaluation for me.&nbsp; In the past I would attempt to remove horn silver using naval jelly, but that was not as effective and the process did darken the treated coin in sometimes not a desirable way.&nbsp; The &quot;waxy&quot; horn silver is especially problematic using this approach.</p><p><br /></p><p>I really like the work you did with the posted coins, especially the first one.&nbsp; That must have been quite a chore.[/QUOTE]</p><p><br /></p>

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