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hankronAs toning is natural and expected on Old Judges and similar, I tend to beleive the image (if it's to be graded) should be judged on overal clarity, contrast and attractiveness. Color and darkness will vary from card to card, but if the image is sharp and dark and detailed, that's what counts. Certainly, if there is a distracting pattern to the toning (dark one part, light another) or there is heaving foxing that likely effect the grade.
Personally, I give two grade descriptions to a photo. One to the overall photo (bent corner, stain on back, etc) and one to the image itself (crystal clear image). I have no idea how I would calculate the two grades into a single grade 1-10, and don't see why I would want to.