Spy Pen

This combination invisible ink marker and UV black light flashlight is guaranteed to produce hours of fun! It writes with invisible ink made of special high-brightness ultraviolet viewable compounds. This means the ink is invisible under normal light! Once the message has been written in invisible ink, it's time for the black light. Okay, so technically it's not really a "black" light, but that's the popular term for ultraviolet energy near the visible spectrum of light. Flip the pen over, shine the light on the spot where the ink was used and your hidden message will be illuminated. Black light products are used for a wide variety of applications, including sanitation, particle identification, art displays, color matching, raves, parties, and, in this case, revealing secret spy messages!

Features:

• One 5-inch long spy pen
• Uses four standard LR41 watch batteries (batteries are included)
• Ultraviolet light reveals secret hidden messages
• Comes packaged on a blister card with instructions
• Excellent as a stocking stuffer, for use in science fair projects, and more!

CAUTION: Although it appears invisible, the ink is permanent and will not wash out of most surfaces. If applied to skin it will eventually wear off.