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posted by janrinok on Sunday February 05 2017, @10:26PM   Printer-friendly
from the solution-looking-for-a-problem dept.

Yadong Yin [...] and his colleagues at the University of California at Riverside have invented a type of paper that can be printed on using just light, erased by heating, and reused up to 80 times.

Yin created nanoparticles, which are a million times smaller than the thickness of human hair, with the dye Prussian blue, or its chemical analogues, and titanium oxide, which is commonly used in white wall paint. This mixture is then applied to normal paper.

When the coating is exposed to ultraviolet light, electrons from titanium oxide move to the dye in the nanoparticle. This addition of electrons makes the blue dye turn white. Focusing the ultraviolet light into shapes, you can print white words on a blue background—or blue words on a white background, which are easier to read.

If left alone, the paper reverts to its original state in five days. That process can be accelerated by heating the paper to 120 °C (250 °F) for 10 minutes.


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  • (Score: 2) by mcgrew on Monday February 06 2017, @04:55PM

    by mcgrew (701) <publish@mcgrewbooks.com> on Monday February 06 2017, @04:55PM (#463509) Homepage Journal

    1970s? How about '50s and '60s? I graduated high school in 1970. And yes, they stank.

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  • (Score: 2) by JoeMerchant on Monday February 06 2017, @10:24PM

    by JoeMerchant (3937) on Monday February 06 2017, @10:24PM (#463738)

    So, I graduated Middle School in 1980, and they were just starting to move away from those things then.

    Not surprising they were in use in the 50s - the odor reminds me of dry cleaning...

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