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<p>[QUOTE=&quot;GDJMSP, post: 2902721, member: 112&quot;]I strongly disagree with this. You are right in that toning only has one purpose, but that purpose is the quite literal and ultimate destruction of the metal it is affecting. </p><p><br /></p><p>The very word toning is nothing more than a euphemism for what it really is - corrosion. In all its forms and on all metals it is the same, and it dos not stop, not ever. It will continue until the metal is completely destroyed, literally until there is no metal left. It doesn&#039;t matter if the metal is 16 inches thick such as the hull of a battleship or only a few millimeters thick such as a coin, if left unchecked it will continue until there is nothing left but detritus.</p><p><br /></p><p>I&#039;ll partially agree with part of your comments in that it seems like some toning being on a coin slows down additional toning. And a lot of people would say that is so. But in reality it isn&#039;t. We think it is because that is what we see happen, or what we think see happen. But it&#039;s not the toning being there that is slowing things down, it is a combination of two things: the storage methods we use that reduce the amount of air getting to a coin, and the fact that the progression of the toning, of the corrosion, is occurring beyond our eyesight for we can only see the top layer, not what is happening underneath.</p><p><br /></p><p>Yes, eventually, with time, the top layer also changes, it will become darker, thicker, more granular and sometimes even powdery. But that is because the detritus from beneath is being pushed up through the top layers.[/QUOTE]</p><p><br /></p>

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