I came across this green IH penny, it's in great shape, just green. This isn't normal toning is it? Maybe wrong planchet or a type of PMD? What do you think
1. Can you take a picture against a neutral (gray, black, or white) background? The hot pink makes it hard to tell what color the coin really is. 2. Verdigris, a type of corrosion affecting copper, is green. If you find a green cent, that's almost certainly what it is.
Hope these pics help... The " hot pink " is actually the back of the official red book for coins ( slightly sun faded)
Which goes under the general term "verdigris". A quick check indicates that it is most often copper carbonate, copper chloride or copper acetate depending on the chemical environment it was found in.