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<p>[QUOTE=&quot;GDJMSP, post: 25856614, member: 112&quot;]It&#039;s not corrosive on the host coin either, nor is it corrosive on any other coin.</p><p><br /></p><p>I don&#039;t know how else to explain this. The verdigris, the green stuff, that is literally what used to be copper. But it is no longer copper, it has been chemically and physically changed from copper into verdigris as a result of the corrosion caused by the air combined with the humidity within the air. </p><p><br /></p><p>Take away the air, corrosion will no longer occur. Take away the humidity, corrosion will no longer occur. Do either one of those two things, but leave the verdigris on the coin, and corrosion will no longer occur.</p><p><br /></p><p>To put it another way, the corrosion eats the copper (the metal) one thin layer at a time. This happens at the molecular level. And when it is done eating all of the elements out of the metal that it wants, what is left behind is the green stuff, the verdigris. And yes, as long as the coin is stored in the same place and under the same conditions, the corrosion will continue and even more verdigris will be produced and build up upon the verdigris that was previously there.&nbsp; </p><p><br /></p><p>If you put a cow in a pasture it will eat the grass. And when it comes out the other end it is no longer grass. Verdigris, is what comes out the other end.[/QUOTE]</p><p><br /></p>

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