Xerox scientists have created the erasable paper: image and text printed on it disappears within a day, and the paper can be reused again and again (which saves trees!)
To develop erasable paper, researchers needed to identify ways to create temporary images. The "a-ha" moment came from developing compounds that change color when they absorb a certain wavelength of light but then will gradually disappear. In its present version, the paper self-erases in about 16-24 hours and can be used multiple times.
Link - via Tech Ticker
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