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<p>[QUOTE=&quot;Just Carl, post: 125744, member: 4552&quot;]You never stated what type of coin you were reffering to. Is it in fact a Silver coin? What denomination? What date and mint mark? Please note many coins that appear to be Silver are in fact not Silver and do not contain Silve at all. If the spot is indeed PVC, which is Poly Vinyl Chloride, which is doubtful, it will not spread on the coin. More than likely the spot is some other contaminate if on real Silver. In any case the suggestion of using Acetone is pretty good. If it is a good grade of Acetone, it will not leave a residue and will remove most unwanted contaminates without being to much of a considered cleaned coin. If the spot is a form of&nbsp; Silver Nitrate or similar compound, as you remove the contaminate, you will also remove a portion of the Silver since the spot was formed with the Silver and a nitrate. If your coin is in fact a modern coin it may not contain any Silver at all and the Acetone bath will have very little effect on the coin itself but will remove added on contaminates. As to time, try for a few hours first, then longer as required. Even for a day will not effect the coin.[/QUOTE]</p><p><br /></p>

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