In 2000, Canadian cents were steel coated with copper. Any breaks in the copper coating would cause the underlying metal to deteriorate and essentially rust. Either that or Liz is going through puberity.
Actually it is mentioned in a small paperback from the 1940's issued by the Johnson Smith Co. called the American Slanguage Dictionary. (ain't)
It looks like oxidation caused by very severe environmental issues. Canadian cents minted after 2000 are copper-plated steel, and any break in the copper would cause ugly oxidation, causing a details grade. There, didn't say it.
See? You can describe the coin accurately without using that terrible "C" word. Should have thought of that.
Yeah, yeah.... but for some of the older folk, we grew up with this little boy named Opie who, in order to get a free ice cream cone, promised Miss Ellie that he "ain't gonna say ain't no more" which, in turn, rubbed off on us.