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<p>[QUOTE=&quot;Oldhoopster, post: 7844832, member: 84179&quot;]Lots of nonsense going on in this post.&nbsp; When working with numismatic items, NEVER, NEVER, clean them, ESPECIALLY with any method that requires rubbing.&nbsp; If you do, you will significantly reduce the numismatic value. If you must experiment, do it on coins that are only worth face value or are damaged and have little or no numismatic value.&nbsp; </p><p><br /></p><p>Toning/tarnish occurs when the metal surface of coin reacts with the environment to form oxides, sulfides, and other fun chemical stuff.&nbsp; Abrasive cleaning (rubbing, polishing) removes the tarnish and stains, but it also removes the original surface of the coin.&nbsp; it can leave fine scratches, hairlines, and an unnatural appearance that can be seen for decades and longer.&nbsp; Dips also remove the surface layers but do it through a chemical rather than physical process. (Acetone, xylene, and solvents are a different beast, check the archives for info)</p><p><br /></p><p>If you have a background in chemistry or metallurgy, and have a lot of experience, you may be able to improve the appearance of a coin.&nbsp; But 99%+ of the cleaning jobs will crash and burn.</p><p><br /></p><p>BTW:&nbsp; Pure gold doesn&#039;t tarnish.[/QUOTE]</p><p><br /></p>

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