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<p>[QUOTE=&quot;GDJMSP, post: 7669079, member: 112&quot;]You were right to begin with John - toning and verdigris are completely different things. The thing the two have in common is that they are both forms of corrosion. But they are different forms of corrosion caused by different things. And no, toning is not early verdigris on copper. Copper can and quite often does go through the complete toning cycle from beginning to terminal - without verdigris ever forming on the coin ! That said, you can have toning and verdigris both on the same coin. And/or, you can have verdigris on a coin with no or very, very little toning at all.</p><p><br /></p><p>Here&#039;s the thing people don&#039;t seem to get. Verdigris is a very specific thing, in simplest terms it is what used to be copper. In other words the former copper molecules turn into verdigris. Verdigris the material that results from a specific type of corrosion. Think of it like this, verdigris is to copper what rust is to iron and steel. </p><p><br /></p><p>And verdigris can also occur on just about any coin. It occurs on copper coins, silver coins, gold coins, and even nickels. But that is because pretty much all of these coins have some copper in them. </p><p><br /></p><p>As to the original question - </p><p><br /></p><p><br /></p><p><br /></p><p>Never, they are merely different forms of corrosion. Copper is kind of unique in that regard. Verdigris is a green powdery substance, it can turn hard and crusty over time, but when it initially forms it&#039;s powdery in form. Toning on the other hand is completely different. It can on occasion be virtually any color, but it is never a powdery green substance. And toning and verdigris can both literally &quot;eat&quot; the copper leaving behind pits in the surface. </p><p><br /></p><p>So while toning and verdigris haver some similarities they are definitely not the same thing, nor does one ever turn into the other.[/QUOTE]</p><p><br /></p>

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