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Schneier on Security

• 

  Invisible Ink Pen

  Posted: May 19th, 2009, 7:49am CDT

  Tags:    [edit]

  This is cool. It writes like a normal pen, but if you run a hair dryer over the written words they disappear. And if you put the paper in the freezer the words reappear. Fantastic. EDITED TO ADD (5/20): This is the same technology as the widely available Pilot Frixion pen. Here's a temperature sensitivity test, and a freezer test....