May 06, 2008. /Lesprom.com/. Xerox boffins have emerged from their smoke-filled labs waving paper that has special ink that makes its contents vanish within 24 hours. The innovation means that paper which would have been doomed to the rubbish bin or shredder can now be reused. This could save countless trees and the average company GBP70 ($140) a year for each employee, buy Xerox's calculations. The sheets are coated with chemicals which turn white whenever they are run through a special printer or even left on a desk for 24 hours. The chemicals react to ultraviolet light, any text disappears and new text can be printed on top. Xerox said that if no one tries to doodle on the paper or make it into amusing paper animals the invention could save more than seven trillion pages a year. Xerox think that their invention will be on punter’s desks by next year. The invention is a sign that a paperless office is unlikely to be with us for some time. Xerox thinks that 44.5 per cent of documents are printed out to be used once and a quarter of them are put into recycling bins the same day.