Is it possible it reversed carbon spot?
I had obtained a High Relief Saint around 2 1/2 Years ago. When I received it I could've sworn there was a carbon spot on the knee. I confirmed it when I dug up the initial photo's I had taken of it. During the last 2 1/2 years this coin was kept in an Intercept Shield Double Row slab storage box at my bank safety deposit box. I recently pulled it out and lo and behold, no carbon spot on the knee! Is it possible the chemical within the intercept shi