The News Minute | December 8, 2014 | 12:10 pm ISTScientists in California have developed rewritable paper that is based on the colour switching property of commercial chemicals called redox dyes, according to a report on Phys.Ninety percent of all information in businesses today is made available on paper as writing material and is discarded after one time use, said the report.According to the report the dye used forms the imaging layer of the paper and printing is done by using ultraviolet to photobleach the dye, except the part which constitutes the text on the paper. The new rewritable paper can be erased and written on more than 20 times with no loss in contrast and resolution, said the report.The report quoted Yadong Yin who is a professor that led the research saying, “"This rewritable paper does not require additional inks for printing, making it both economically and environmentally viable. It represents an attractive alternative to regular paper in meeting the increasing global needs for sustainability and environmental conservation."The rewritable paper is made of glass and plastic film on which letters and patterns can be printed many number of times and then be erased by simple heating.