Chinese Chemists Create Printer that Uses Water Instead of Ink
A team of chemists claims their "water-jet" technology allows each page to be reprinted dozens of times—a money- and tree-saving option in a digital world that still relies heavily on hard copy.
"Several international statistics indicate that about 40 percent of office prints (are) taken to the waste paper basket after a single reading," said Sean Xiao-An Zhang, a chemistry professor at Jilin University in China, who oversaw work on the innovation.
The trick lies in the paper, which is treated with an invisible dye that colors when exposed to water, then disappears....
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