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<p>[QUOTE=&quot;Oldhoopster, post: 3935729, member: 84179&quot;]I&#039;m not sure what you mean by noninvasive.&nbsp; Toning on copper and silver coins is formed when the metal atoms at/near the surface of the coin react with other elements in the environment to form sulfides, oxides, etc.&nbsp; Cleaning methods like electrolysis and chemical dips remove that material, which in actuality, is removing part of the original coin.&nbsp; Cleaned coins are considered to be damaged, and with a little experience they aren&#039;t difficult to recognize</p><p><br /></p><p>There is nothing wrong with experimenting on low value coins.&nbsp; Just be aware that coins like your proof dime will have a diminished value and less desirable to other collectors[/QUOTE]</p><p><br /></p>

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