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<p>[QUOTE=&quot;desertgem, post: 2064667, member: 15199&quot;]Any method which leaves physical evidence of cleaning @ 10X or less is an improper one.&nbsp; One which does not is proper. Copper, Silver , and Gold are less hard than cellulose ( paper, cloth ( including microfiber), toothpicks, bamboo, thorns ( green or otherwise) etc.) , plastics, dental picks, screwdriver, soda blasters, etc. etc.</p><p><br /></p><p>Cleaning ( restoring) with chemicals is a one way dangerous ( for the coin and possibly you) path, yet most speed down it without learning the techniques of the procedures. Most dips are extremely concentrated for quick results. Most are safe if you dilute it 10X with water and take 5-10 minutes or more to do the job, stop,&nbsp; rinse with water, and then rinse with acetone and hold by the rim until airdry. Acetone removes any microscopic amounts of residual water and does not harm the metal coin. A knowledge of chemistry is quite useful.</p><p><br /></p><p>There are many other threads on using acetone for removing organic material ( not toning or corrosion) from coins you can search on the site.[/QUOTE]</p><p><br /></p>

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