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<p>[QUOTE=&quot;SuperDave, post: 2698741, member: 1892&quot;]Yes, if you allow the conditions under which a coin tones to remain, it will eventually go through the entire cycle of color - a process which is scientifically known and identified - and end up pretty much black.</p><p><br /></p><p>It&#039;s not difficult to interrupt the process and arrest the color where it&#039;s at, though. All you have to do is get it away from high-enough levels of atmospheric sulfur, and most of us live in areas where this is the normal state of things. Most toning occurs as a result of storage right next to sulfur sources, like the cardboard of old albums or paper envelopes with sulfur content in the paper.[/QUOTE]</p><p><br /></p>

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