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<p>[QUOTE=&quot;Roerbakmix, post: 4795904, member: 100731&quot;]Thanks [USER=111037]@Only a Poor Old Man[/USER]. To answer your question: yes, it is relatively easy, but recognizing which coins benefit from cleaning, and which don&#039;t requires a learning curve. I&#039;ve cleaned quite some silver antique coins so far, but no cleaning project is the same.</p><p><br /></p><p>This one I expected to react quickly, for reasons mentioned above (and other, more subtle signs that are not really visible on a photo). Sodium thiosulphate is readily available and not too expensive, as is distilled water. It&#039;s only suitable for horn silver, and will react only with AgCl or AgBr (whichever is present on the coin) - so it will leave the patina intact. </p><p>The dark layer Na3[Ag(S2O3)2] is easily removed by gently rubbing the coin. In some cases, it&#039;s a nice method to repatine coins with horn silver that were heavily cleaned: the horn silver disappears, and a thin greyish layer stays. </p><p><br /></p><p>Regarding whether or not the value increased: I have no idea. I guess it has. We will find out how well it sells, but since we obviously have no control coin (i.e. an uncleaned coin of similar quality), I can&#039;t draw any conclusions.[/QUOTE]</p><p><br /></p>

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