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<p>[QUOTE=&quot;GDJMSP, post: 4046450, member: 112&quot;]I didn&#039;t say MS70 would harm coins. I said you shouldn&#039;t use it on just any coin, that you should only use it for its intended purpose. It&#039;s intended purpose is to remove haze from coins, and light dirt and grime that may be on the surface. But my primary point for saying to only use it for its intended purpose is because in all but a few cases, there is something <b>better</b> to use than MS70.</p><p><br /></p><p>But it does need to be noted that you should never use MS70 on copper coins, the reason being that it will cause copper coins to turn blue or a purple shade of color.</p><p><br /></p><p>Paint thinner, that&#039;s a different matter all together and it should never be used on any coin for any reason. Paint thinner contains hydrocarbons and it is absolutely harmful to coins. </p><p><br /></p><p><br /></p><p><br /></p><p>Then whatever you were trying to remove - was absolutely NOT PVC residue ! You might have thought it was PVC, but I guarantee you it wasn&#039;t because acetone will always remove PVC residue. And acetone is harmless to coins, except sometimes copper. Which is why I said to use xylene to remove PVC residue on copper coins. And yes, xylene is harmless to coins.</p><p><br /></p><p>PVC residue, when it first forms on a coin, it&#039;s crystal clear and only be seen with effort, and sometimes not at all. As it ages, it changes color, turning milky looking at first, and then darkening to different shades of color. At one point it&#039;ll turn a greenish shade, and then darken some more maybe becoming a brownish shade, and in some cases even almost black. And once it dries out completely it&#039;s usually a brown or tan shade.[/QUOTE]</p><p><br /></p>

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