disappearing ink

11.23.09

New "Disappearing" Nanoparticle Ink Keeps Messages Cryptic

By Clay Dillow Posted 08.27.2009 at 1:45 pm 1 Comment

Remember when, as a kid, you would pen secret messages with "disappearing ink" by writing on paper with lemon juice? A team of researchers at Northwestern have taken the idea just a little bit further, engineering a nanoparticle ink that fades away at a predetermined time, keeping maps or messages away from spying eyes.

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