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<p>[QUOTE=&quot;GDJMSP, post: 475238, member: 112&quot;]Ruben my friend, you have a bit to learn about toning. Yes, brightly colored toning is a result of contamination if you wish to put it that way. But that contamination can be the result of many different things. Most often, it is just the air. But in various parts of the country the air can be quite different. And different air does different things to coins. </p><p><br /></p><p>It also does different things to other silver objects, like candlesticks, silverware, plates and serving dishes. Yes, I have often seen rainbow toning on all of the above. Spent more than 1 Saturday as a kid trying to polish it all off. How silver tones depends entirely on its environment. And just because you have never seen it pal - doesn&#039;t mean that it doesn&#039;t exist.</p><p><br /></p><p>And Paul, contrary to popular belief, rainbow toning on a coin is not always the result of bag toning. There are 2 ways that bag toning is typically identified. One is if the coin has come in contact with the bag itself - that results in what is most often called textile toning because you can actually see the threads of the canvass bag toned onto the coin. The other, although it is not always the cas ebut most think it is, is when when you see a crescent shaped toned arc across the coin. This occurs because 1 coin was covering a portion of the underlying coin - that&#039;s what forms the crescent. But the rainbow color, it could have been a bag or it could have been a cardboard box with coins stacked inside. Under the right conditions both will result in the same thing.</p><p><br /></p><p>Bottom line, there are very, very few cases where the cause of any particular toning can be positively identified. There are exceptions of course like textile toning and tab toning, but virtually all other toning can be the result of various things - regardless of how it looks or if it is rainbow or not.</p><p><br /></p><p>And while toning does indeed form a protective patina on the surface of the coin, if it is left unchecked the toning can and will progress to the point that it becomes corrsoive. It might take a while, but it will.[/QUOTE]</p><p><br /></p>

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