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<p>[QUOTE=&quot;walterallen, post: 151158, member: 4068&quot;]This is almost a metalurgy lesson. Basically the atmostphere/environment in which coins are kept is the cause for the toning effects. Different environments will cause different reactions. Elements and chemicals in the air along with temperature will have a lot do to with the effects as well. </p><p><br /></p><p>I for one love a rainbow tone which is or can be caused by leaving a coin in contact with certain paper products that release chemicals into the air &quot;over time&quot; that the metal of the coin reacts to &quot;over time&quot;. </p><p><br /></p><p>My understanding that the natural toning process takes years/decades to product the rainbow effect that i love so much. It reminds me of the colors of the sky in the morning and at dusk.[/QUOTE]</p><p><br /></p>

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