Disappearing Ink Pen

From Conservapedia - Reading time: 1 min

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The disappearing ink pen is a tool used by organized crime gangs. It looks like an ordinary pen, only it contains ink that completely disappears within 48 hours. Even ultraviolet light is unable to find any traces of writing, making it an especially effective mode of communication and extremely difficult for the police or some government agency to find out the gang's plans.