Rewritable Paper Needs No Inks

Researchers have developed a paper that can be printed with UV light and re-written multiple times. The paper can be printed on by exposing it selectively to UV light, resulting in blue text on a colorless background, and the text will remain in place for at least five days before fading back to blue. The text can also be ‘erased’ more quickly by heating the paper, and the coated paper can be re-written up to 80 times.

https://phys.org/news/2017-02-ink-required-paper.html#jCp

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