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littleBits

littleBits UV LED

The littleBits UV LED (or "UltraViolet Light-Emitting Diode") Bit sends out a special kind of light. It looks purple to the eye, but it has some special abilities, like making white fabrics and certain inks glow in the dark. If you have a pen that writes in UV-sensitive ink, you can use it to reveal secret messages.

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