Have you heard The laser unprinter?

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A team of researchers from the University of Cambridge in England have created a laser unprinter that can remove ink without damaging the paper.

Despite both methods using lasers, their (un)printing approaches are fundamentally very different. In a laser printer, a laser is used to give individual “pixels” on a piece of paper a positive charge (pictured below). Negatively-charged toner particles stick to these positive regions, and a heat source then fuses the toner to the paper.

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