• An Unusual Book

    10/07/2014 at 01:32 0 comments

    This is a cool book that prints using "print on demand" technology, yet has "invisible writing" that can only be viewed with a blue LED. The invisible writing is yellow toner which is hard to read normally, but turns "dark" when backlight by fluorescence from the brighteners in the papers. Tank a looks here Kickstarter under "An Unusual Book". Great gift idea :)