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Posted By: tbob

There have been several comments to the effect that the grading companies differentiate between power erasing and mere erasing by hand with an eraser. I don't think this is true. I once submitted an E94 Cobb which "acquired" a tiny mark in the white border. I carefully erased the mark with an expensive art eraser and the card came back from SGC as "altered" although what was removed was not something on the card when it was made. The mark could not be seen but apparently under the microscope or loupe or whatever, it showed signs of an erasure. Again, this was in the border and very small.