Paper That Needs No Ink To Print (Not E-Paper)

A team of researchers has developed a new type of paper that can be reprinted more than 80 times and doesn’t require a drop of ink. When exposed to ultraviolet light, it—ordinarily, blue due to a coating of nanoparticles—turns colorless, rendering the text in blue.

The document has a shelf-life of about a week, after which it slowly fades back to a sheet of solid blue. For faster erasure, the paper can be heated to 250 degrees Fahrenheit.



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