They say that even in early prototype form, it can be rewritten 20 times without affecting the resolution.

 

It works by using ultraviolet light to photobleach a dye in the paper, except the portions that constitute the text on the paper.

 

The new rewritable paper can be erased and written on more than 20 times with no significant loss in contrast or resolution.

 

Chemists at the University of California,Riverside say their rewritable paper is based on the color switching property of commercial chemicals called redox dyes.

 

The dye forms the imaging layer of the paper.

 

'This rewritable paper does not require additional inks for printing, making it both economically and environmentally viable,' said Yadong Yin, a professor of chemistry, whose lab led the research, which is published today in Nature Communications.

 

'It represents an attractive alternative to regular paper in meeting the increasing global needs for sustainability and environmental conservation.'

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