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<p>[QUOTE=&quot;cmezner, post: 8214922, member: 87809&quot;]I am no expert at all in cleaning coins. Silver, even though nobler than copper, when exposed to sulfurous elements can build a silver sulphide coating on some parts, but also on the whole coin. Silver sulphide has a dark-brown to black color. Removing horn silver is quite complicated; in my opinion, if the silver contents is good it should be treated professionally. </p><p>The second coin shared (Tiberius) in the OP seems to be damaged by a treatment that wasn’t professional and by removing the horn silver it exposed a corroded surface.</p><p><br /></p><p>I have this tetradrachm almost all covered in horn silver; one can see silver shining through on both sides, but I just leave it as is, it gives character to the coin and it protects the surface below <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>Cilicia, Tarsus, ca. 1 BC - 10 AD, RPC suggest ca. 5 AD</p><p>24 x 26 mm, 14.838 g</p><p>RPC I 4004; Prieur 748; SNG BN 1388; SNG Levante 988;</p><p><br /></p><p>Ob.: ΣΕΒΑΣΤΟΥ ΚΑΙΣΑΡΟΣ laureate head right</p><p>Rev.: MHTPO(ΠOΛ)EO(Σ) Tyche of Tarsus seated right on rock, holding palm frond; below, half-length figure of river-god Kydnos swimming right; TAP monogram (for Tarsus) in right field</p><p>[ATTACH=full]1441854[/ATTACH] </p><p>[ATTACH=full]1441855[/ATTACH][/QUOTE]</p><p><br /></p>

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