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<p>[QUOTE="jseaman, post: 129888, member: 5538"]Cleaning is appropriate in some cases. For circulated coins, it is almost never recommended. For ancients, it is usually required. For proof issues and some uncirculated coins it may actually be desirable.</p><p><br /></p><p>The word cleaning covers a very broad range of treatments that coins may receive. From the weeks long soaking in olive oil and physical scraping that ancient coins face when they are cleaned to the quick bath in acetone followed by distilled water that may be the appropriate cleaning method for proof coins. These two methods of cleaning are actually well accepted and fairly common among the pros. It is the chemical treatment of circulated coins that is widely frowned upon.</p><p><br /></p><p>These other cleaning methods are usually treatments that actually cause a chemical reaction in the coins' metallic surfaces. A bright and shiny coin with worn features is just not natural. This one should be obvious to most anyone. Removing the tarnish from an otherwise like new cent is also a no-no. The new surface simply never looks natural. The chemical action of cleaning actually removes a layer of the coins original surface. Even allowing a cleaned coin to re-tone over several years never restores it to its original appearance. A trained eye can always catch one of these coins.</p><p><br /></p><p>Improper cleaning can ruin a coin's value for all time. DON'T DO IT! It is an unusual coin that can benefit from cleaning - leave it to the experts.[/QUOTE]</p><p><br /></p>
[QUOTE="jseaman, post: 129888, member: 5538"]Cleaning is appropriate in some cases. For circulated coins, it is almost never recommended. For ancients, it is usually required. For proof issues and some uncirculated coins it may actually be desirable. The word cleaning covers a very broad range of treatments that coins may receive. From the weeks long soaking in olive oil and physical scraping that ancient coins face when they are cleaned to the quick bath in acetone followed by distilled water that may be the appropriate cleaning method for proof coins. These two methods of cleaning are actually well accepted and fairly common among the pros. It is the chemical treatment of circulated coins that is widely frowned upon. These other cleaning methods are usually treatments that actually cause a chemical reaction in the coins' metallic surfaces. A bright and shiny coin with worn features is just not natural. This one should be obvious to most anyone. Removing the tarnish from an otherwise like new cent is also a no-no. The new surface simply never looks natural. The chemical action of cleaning actually removes a layer of the coins original surface. Even allowing a cleaned coin to re-tone over several years never restores it to its original appearance. A trained eye can always catch one of these coins. Improper cleaning can ruin a coin's value for all time. DON'T DO IT! It is an unusual coin that can benefit from cleaning - leave it to the experts.[/QUOTE]
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