Volume 92 Issue 5 | p. 25 | Concentrates
Issue Date: February 3, 2014

Rewritable Printer Paper Could Replace Ink-Jet Technology

Hydrochromic dyes turn colors when exposed to water
Department: Science & Technology
News Channels: Environmental SCENE, Materials SCENE
Keywords: rewritable paper, hydrochromic dyes, water-jet

Despite the ubiquity of electronic information, the use of printed paper continues to present a major environmental problem. Now, Minjie Li and Sean Xao-An Zhang of Jilin University in China and colleagues report the development of a new rewritable paper that contains hydrochromic molecules—dyes that turn colors when exposed to water. Pages impregnated with the dyes can be printed using ordinary ink-jet printer technology by replacing the ink in cartridges with water. The dyes can . . .

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