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BobInterestingly enough the comic book graders will "slab" the books and give a grade but then give a different color to the label if alterations or restoration have occurred (green) or a page is missing or a coupon cut out (purple) as opposed to the blue labels if everything is ok. They also spell out any problem on the label. Their code reminds me a lot of the PSA MC, PSA MK grades. With regard to restoration they seem to lump a tiny color touch in with the most major restoration.
Note- I think I have the colors correct, it's been quite a while since I was involved in the comics.