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<p>[QUOTE=&quot;robinjojo, post: 25390527, member: 110226&quot;]Basically, I think that a long soak in 100% acetone should remove all PVC residue.&nbsp; If there is still some remaining, perhaps a second soak is in order.&nbsp; Acetone is a powerful solvent, and I find that it effectively removes PVC residue very quickly.</p><p><br /></p><p>Now the after photos of your coin indicate to me that the PVC is gone.&nbsp; Did you rinse the coin with distilled water?&nbsp; Using tap water may introduce chemicals, such as chlorine that may affect the surface.&nbsp; Distilled water is best.&nbsp; </p><p><br /></p><p>Are you concerned about the darkish lines running across the obverse and reverse?&nbsp; Those are very light deposits of silver oxide, possibly some kind of chemical interaction with an envelope in which the coin was restored.</p><p><br /></p><p>I&#039;ve never used Xylene or Toluen so I cannot give you any advice for these chemicals.&nbsp; </p><p><br /></p><p>There is one chemical that is used by ancient coin collectors to remove horn silver, thick black deposits that occur on silver coins.&nbsp; This is <b>sodium thiosulphate</b>. It usually comes a small tablets that are dissolved in hot distilled water.&nbsp; This chemical is very effective in removing black deposits without affecting the coin&#039;s surfaces.&nbsp; However, depending on how thick the deposits are, there might be corrosion underneath.&nbsp; Given the very light color of these lines, that is probably not an issue with this coin.&nbsp; </p><p><br /></p><p>If you do use this chemical, I would suggest that you test it on an inexpensive coin to see the results.&nbsp; It does, based on my experience, leave the surfaces intact as far as mint luster is concerned.&nbsp; The trick is to rise the coin quickly and thoroughly with distilled water followed by drying in a soft towel - no rubbing.</p><p><br /></p><p>Cotton swaps are pretty safe to use if they are used to lightly dislodge deposits.&nbsp; I use them extensively on ancient and modern coins without any adverse results.</p><p><br /></p><p>Here&#039;s a thread that discusses sodium thiosulphate:</p><p><br /></p><p><a href="https://www.cointalk.com/threads/how-to-remove-encrustation-from-r-r-coin.348784/" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/how-to-remove-encrustation-from-r-r-coin.348784/">https://www.cointalk.com/threads/how-to-remove-encrustation-from-r-r-coin.348784/</a></p><p><br /></p><p>Hope this helps, and good luck![/QUOTE]</p><p><br /></p>

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