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<p>[QUOTE=&quot;robinjojo, post: 8285459, member: 110226&quot;]I&#039;m not sure that the dark spots are PVC.&nbsp; It&#039;s difficult to determine based on the image. PVC deposits are dark green, and depending on how long the deposit has been around, the spot can range from hard to oily.</p><p><br /></p><p>In any event, PVC can be removed with a 100% acetone bath.&nbsp; The acetone must be 100%, not the diluted perfumed nail polish remover commonly available in the beauty isle.&nbsp; The acetone will dissolve the PVC without harming the surface of the coin.&nbsp; There is a chance that the surface under the PVC might be different from the surrounding surface, but it should tone over time to a more uniform shade.</p><p><br /></p><p>Using 100% acetone does require cautionary measures.&nbsp; The area must be well ventilated, don&#039;t breath the fumes!&nbsp; Also, acetone at this level is extremely flammable, so no open flame other source of possible ignition.</p><p><br /></p><p>Depending on the hardness of the deposits, the coin might need to stay in the bath for, say, 10 minutes.&nbsp; Inspect the coin and put it back in the bath if needed.&nbsp; Oily PVC deposits dissolve almost instantly in 100% acetone.&nbsp; Once the deposits are gone, rise the coin with distilled water and carefully pat dry in a soft towel.&nbsp; Don&#039;t rub - gently pat the coin.&nbsp; Then, let the coin air dry for several days.&nbsp; If there are any areas that appear light is shade after treatment, they often darken over several days.&nbsp; I keep the coins that have been cleaned out for weeks, sometimes months, to help them &quot;readjust&quot;.</p><p><br /></p><p>Now, having said all of this, the dark spots on the obverse could very well be silver oxide deposits, quite minor as these thing go. They seem to be black.&nbsp; Acetone will have no effect on them.&nbsp; I suggest, then, leaving the coin alone.&nbsp; Any attempt to remove these spots chemically will very likely result in the loss or disruption of the really nice toning that the coin currently has.</p><p><br /></p><p>That&#039;s a lovely example.&nbsp; Congratulations![/QUOTE]</p><p><br /></p>

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