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Experts have revealed a new type of paper that can be erased and rewritten without the need for ink. 研究人员成功研制出一种可重复书写的新型纸张，且书写打印时无需油墨。 They say that even in early prototype form, it can be rewritten 20 times without affecting the resolution. 研究者称，即使是初期版本，这种纸也能反复擦写20次，而且可保有较高的清晰度。 It works by using ultraviolet light to photobleach a dye in the paper, except the portions that constitute the text on the paper. 再写纸的原理是：利用紫外光漂白某些染料，使之呈现出无色状态，而只有文字或图像可在纸上显示出来。 The new rewritable paper can be erased and written on more than 20 times with no significant loss in contrast or resolution. 这种新的再写纸能反复擦写20次多，且不会影响对比度或清晰度。 Chemists at the University of California,Riverside say their rewritable paper is based on the color switching property of commercial chemicals called redox dyes. 加利福利亚大学河滨分校 The dye forms the imaging layer of the paper. 这种染料能形成纸的成像层。 '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. | 
