I was told that if u take bleach and add certain dyes you want and soak the coin it will tone it and doesn't come off. I just haven't tried yet but best way to clean copper is acetone mixed with Murphy oil soap i use about 2 tablespoons of Murphy and about half cup of acetone mix put in glass bowl 1 coin sit over night does miracles. Took few trys to master the ratio lol
Even if they are grading it as AT it makes me wonder whats going on and why it's not graded as details.
No problem. I have had quite a few AT ASE's, some spectacular, and every one of them in an ANACS slab said, MS60 - Details. They are consistent, and tell it like it is, giving them the lowest grade of uncirculated.