It is a Tipp-Ex for the computer age. Engineers have developed a way of using lasers to remove ink from paper so it can be reused in printers and photocopiers.
The researchers at the University of Cambridge used short pulses of laser light to delete words and images that have been printed onto paper.
The laser vaporises the toner ink without damaging the paper and opens up the prospect of future computer printers and photocopiers having an "unprint" function to allow paper to be reused.
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