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"Now, I must warn you that the most stringent anti-cheating charms have been applied to your examination papers. Auto-Answer Quills are banned from the examination hall, as are Remembralls, Detachable Cribbing Cuffs and Self-Correcting Ink."
-- Professor McGonagall (OP31)
Self-Correcting Ink, an ink that corrects errors, is banned from the examination hall at Hogwarts by the Wizarding Examinations Authority (OP31).
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