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Black Light Pen and Black Light Keychain Combo.
Experiment with your Mini Black Light key chain for a personal fluorescent show! "Black Light" is really ultra-violet light, which is naturally present as a component in sunlight. Ultra-violet wavelengths are very short with a very high frequency, and can be used to detect florescent material that would remain invisible under normal conditions. When you shine ultra-violet light on fluorescent material, it lights up with a beautiful bluish-green luminescence. Try using the black light with the the Invisible Ink Pen and leave secret messages that can only be revealed with your Mini Black Light!
Recommended for children ages 6 and up. |
