Rewritable Paper that uses light and no ink

Rewritable Paper that uses light and no ink

“Developing efficient photoreversible color switching systems for constructing rewritable paper is of significant practical interest owing to the potential environmental benefits including forest conservation, pollution reduction, and resource sustainability…”

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http://www.nextbigfuture.com/2017/02/rewritable-paper-that-uses-light-and-no.html