Paper That Needs No Ink To Print (And It’s Not E-Paper.)

A team of researchers has developed a new type of paper that doesn’t require any ink to print and can be rewritten more than 80 times.

When exposed to ultraviolet light, the background—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 Fahrenheit.



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