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Josh K.David - that is incorrect. I have removed pencil marks with an eraser (by hand) and had those cards graded by sgc. I have also tried to erase pen (which of course really doesnt work). The result was an obvious lightening of the area around the pen. Still graded by sgc, but no benefit since the mark was still there. I think the only time sgc will reject a card is when it was bleached to remove the mark or power erased.