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<p>[QUOTE=&quot;Roerbakmix, post: 3910966, member: 100731&quot;]Hi DavidPCC, though I&#039;m unable to zoom in, I&#039;m convinced this is horn silver indeed. Using the sodium thiosulphate method, this coin would likely have a good cleaning result (I would definitely do it if it was mine). Sodium thiosulphate anhydrate (not pentahydrate) is cheap and safe to use. </p><p><br /></p><p>This morning, I&#039;ve cleaned this hadrian ar Denarius:</p><p>[ATTACH=full]1030804[/ATTACH] </p><p><br /></p><p>which turned out quite well <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p>[ATTACH=full]1030805[/ATTACH] </p><p><br /></p><p>This is another type of horn silver: a more diffuse rough layer, which usually shows a bit of pitting underneath. </p><p><br /></p><p>In short, there are (in my experience) four types of horn silver:</p><p>1) a metal-like type, as present on the coin by David</p><p>2) a black patchy type, as on the first coin</p><p>3) a diffuse layer, as in this hadrian drachm</p><p>4) a thick encrustation of a dirt, debris, other elements (iron, calcium, etc) with horn silver in it[/QUOTE]</p><p><br /></p>

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