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Most toner goes to printed pages, a large fraction of which are ultimately recycled in paper recovery and recycling operations. Removal of toner from the pulp is not easy, and toner formulations to ease this step have been reported. Hydrolyzable, water-soluble, and caustic-soluble toner resins have been reported, but do not appear to enjoy wide-spread application. Recovery of waste toner with other inks and resins from paper recycling plants occurs as sludge, a low-value off-product.
May I suggest a generous application of white correction fluid.
Can a black and white photocopy be treated in some simple way so that the paper could be reused as scratch paper (not necessarily as copy paper)? Could some treatment cause the ink to fade enough to leave a blank or nearly blank piece of paper?