Inkless Paper Developed

Purple glow within a shade containing an ultraviolet (UV) light bulb. reports on a breakthrough in printing: paper that uses ultraviolet light to print on coated paper. The paper can be heated to 250°F to erase what was printed and re-written to it up to 80 times (re-writable paper).  The researchers believe that this paper, which uses ultraviolet light to speed up chemical reactions between titanium dioxide and Prussian Blue [Bob Ross, anyone?] pigment, can be produced cheaply on a commercial scale. Given that all the required materials – paper, titanium dioxide (already heavily used in beauty products/makeup, sunscreen, and as pigments for medicines, toothpaste, lipstick, creams, etc.), Prussian Blue pigment/dye, and ultraviolet bulbs – are all inexpensive means the materials are likely to be affordable. However, there are a few drawbacks:

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