Message:

<p>[QUOTE=&quot;Leadfoot, post: 316603, member: 2972&quot;]Yes, toning can turn into corrosion.&nbsp; How quickly depends on the surroundings.&nbsp; Regardless, it is not long after the toning on silver goes to &quot;black&quot;.&nbsp;&nbsp; </p><p><br /></p><p>If you inspect coins with areas such as this this under extreme magnification, it is farily clear, but there&#039;s definite point where the blackness of toning starts to &quot;eat&quot; into the underlying luster/mirrors/surfaces, and it is at that point that (in my opinion) toning has turned into corrosion.&nbsp; That&#039;s not to say that all black toned silver is corroded, but beyond a certain point and to the extent it eats into the underlying luster it is.</p><p><br /></p><p>Please also note that that &quot;point&quot; is not often recognized by TPGs and they will allow a certain amount of luster/mirror/surface imparement in a toned coin, and some would even argue that all toning is corrosion (and in a sense they are right!) -- so there&#039;s hardly a concensus on the topic and the interpretation varies by the one doing the evaluation.</p><p><br /></p><p>To help illustrate the point I&#039;m trying to make above, here is an example of a coin that is just about to hit that point, if not beyond it in points (note area around ES in STATES and the dark spot in the denticles and rim near U in UNITED):</p><p><br /></p><p><img src="http://www.pbase.com/miker/image/83999477/original.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>You will note some darker areas that seem to have the luster impared.&nbsp; This is where the toning is starting to eat into the luster, and it is at that point that it becomes corrosion.&nbsp; That said, I own this coin, and it is one of my very favorite coins, so this &quot;problem&quot; far from bothered me given the coin&#039;s grade and price.</p><p><br /></p><p>Although not mint state, here is a coin that has gone past that point and the toning has become corrosion.&nbsp; </p><p><br /></p><p><img src="http://www.pbase.com/miker/image/51473001/original.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>Some might call that crusty, or even a &quot;Circ Cam&quot;.&nbsp;&nbsp; I call it corroded.</p><p><br /></p><p>All of the above is only my opinion based on my experience, and I respect those whose opinions may vary....Mike[/QUOTE]</p><p><br /></p>

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in