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<p>[QUOTE=&quot;GDJMSP, post: 5241557, member: 112&quot;]As others have already answered, yes it absolutely can. But here&#039;s something that nobody mentioned yet. Once a coin has been cleaned, even it was cleaned properly, it will tone faster and more easily than it would have if you left it alone. The coin Yolo posted is a perfect example of that.</p><p><br /></p><p>Of course with proper storage methods you can slow that toning down, but you won&#039;t be able to stop it.</p><p><br /></p><p>edit - I should added for you that the reason the cleaned coin tones faster and more easily is because fresh metal has been exposed. And fresh metal tones faster than metal that has already been toned to one degree or another. Of course, the environment and storage methods matter a great deal too.[/QUOTE]</p><p><br /></p>

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