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<p>[QUOTE=&quot;GDJMSP, post: 1130764, member: 112&quot;]It&#039;s not just copper, it&#039;s all older coins. But there are many different forms of cleaning, some harmful and some not harmful. And it is important to differentiate between the two by using the correct terms - cleaning, and harsh/improper cleaning.</p><p><br /></p><p>The reason that it is accpeted as a fact that such a high percentage of older coins have been cleaned at one time or another is because for centuries it was the accepted practice for collectors to clean their coins. Even museums cleaned their coins. The Smithsonian, to this day, cleans their coins. But it is some of the methods they used to clean them that was bad. The most common method was to simply wipe the coins off with a cloth - very bad.</p><p><br /></p><p>Examples of acceptable methods for cleaning are dipping, either in a coin dip (when done properly), acetone or distilled water. Any use of a cloth, brush or other object (regardless of how soft it is) in actual contact with the coin is unacceptable by today&#039;s standards.[/QUOTE]</p><p><br /></p>

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