Expertshaverevealedanewtypeofpaperthatcanbeerasedandrewrittenwithouttheneedforink.
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。
Theysaythateveninearlyprototypeform, itcanberewritten 20 timeswithoutaffectingtheresolution.
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。
Itworksbyusingultravioletlighttophotobleachadyeinthepaper, excepttheportionsthatconstitutethetextonthepaper.
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。
Thenewrewritablepapercanbeerasedandwrittenonmorethan 20 timeswithnosignificantlossincontrastorresolution.
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。
ChemistsattheUniversityofCalifornia,Riversidesaytheirrewritablepaperisbasedonthecolorswitchingpropertyofcommercialchemicalscalledredoxdyes.
加利福利亚大学河滨分校（UniversityofCalifornia, Riverside）的化学家们表示，再写纸利用了氧化还原染料的颜色转换特性。
Thedyeformstheimaginglayerofthepaper.
这种染料能形成纸的成像层。
'Thisrewritablepaperdoesnotrequireadditionalinksforprinting, makingitbotheconomicallyandenvironmentallyviable,' saidYadongYin, aprofessorofchemistry, whoselabledtheresearch, whichispublishedtodayinNatureCommunications.