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<p>[QUOTE=&quot;physics-fan3.14, post: 3273982, member: 19165&quot;]Nope, not at all. A cleaned coin could have natural toning, or it could have unnatural toning. Sometimes, a doctor will clean a coin to remove ugly surface effects and then apply some artificial toning to make it look more attractive. Sometimes artificial toning will be applied to hide the evidence of cleaning. </p><p><br /></p><p>However, when a coin is cleaned, the passive layer which had formed on the surface of the coin is removed. This makes the coin far more reactive. So, if a coin had been cleaned and then put into an envelope, it is more likely to tone than if it hadn&#039;t been cleaned. The toning is natural - toning which developed as a result of normal, accepted means of storage. But, the coin had been cleaned. Many coins with colorful patterns are the result of the coin having been cleaned and then stored in an environment which promoted natural toning. </p><p><br /></p><p>Additionally, sometimes the chemicals used to clean the coin will accelerate the toning. Dip residue, if not properly removed from the coin, will cause certain types of toning. This is not necessarily considered &quot;artificial toning&quot;, but neither is it accepted as appealing. </p><p><br /></p><p>The effects of cleaning, and the effects of toning have to be considered independently. You can have cleaned coins which have toned naturally, and you can have cleaned coins which toned unnaturally. The cleaning will leave its own evidence. </p><p><br /></p><p><br /></p><p><br /></p><p>Same thing as on an uncirculated coin, really. Cleaning will leave hairlines, unnaturally bright or white areas, polished areas, etc. A circulated coin which is white in the center and has colorful rings around the edges was probably cleaned and then put into an album. A circulated coin with dark centers and rainbow fields was probably original and put into an envelope by a collector decades ago. </p><p><br /></p><p>There is no hard and fast rule.... you just develop a feel for it as you look at thousands of coins. I&#039;m not sure I *really* answered your questions, but I hope that may help.[/QUOTE]</p><p><br /></p>

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