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The Crazy Aaron Black Light keychain is to be used on the ever popular Crazy Aaron Glow in the dark thinking putty. Simply shine the light onto your putty and you will be able to write words and draw doodles directly onto your fun thinking putty. The black light can easily be attached to your set of keys so you are never too far away from it and will always be making doodles, patterns and other designs onto your putty. The black light can also be used to check the legitimacy of currency, examine fluorescent objects and materials and view invisible inks.