Note the under lip? Is that a dark spot there? The green and gray areas that are raised look like what develops on the outer part of a carbon spot. (I can't believe I don't have an image of one in my files?) Over 9500+ images and not a carbon spot image.

This is one, but the reactive agent isn't showing on this one. It is a Proof cent that has a full blown carbon spot on it.
Edited by coop
04/13/2019 9:50 pm