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<p>[QUOTE=&quot;medoraman, post: 1804485, member: 26302&quot;]I have never heard this postulated by anyone. Verdigris, a powdery light green powder magically transforms into a blue, darkgreen, or black,&nbsp; (since all three of these colors are seen interchangably on coins by the same chemical reaction). I simply have nothing to say if this is your hypothesis. I simply hope someone like Doug Smith or Badthad, who would be in a better position to chemically refute this, reads this thread.[/QUOTE]</p><p><br /></p>

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