Soon, an 'Unprinter' to remove ink from papers

Scientists claim to have developed a new technique that can remove ink from printed papers so they can be reused in printers and photocopiers. The technique, developed by a team at the University of Cambridge, uses short pulses of laser light to delete words and images printed on 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, the researchers claimed.

Dr. Julian Allwood, who led the research, said it could drastically reduce the number of trees cut down to produce paper and even provide a cheaper alternative to recycling. 

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