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Help me be the best secret santa ever

Where can I (or can I?) order *one* heat changing coffee mug that displays one custom message when cold and another, slightly different custom message when filled with hot liquid? Google returns only "blank revealing custom image" mugs. Is this even possible? Maybe you can't put regular ink under changing ink? Screenprinting scientists: give me the scoop before I wear my googling fingers to the bone.
posted by lilnublet on Nov 12, 2012 - 11 answers

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