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In a recent episode of MacGyver, an improvised ultraviolet light was created from an LED. How would this work and what is a blacklight?
Shortwave UV LED Flashlight (254nm UVC) - The Pocket Model – Stone Throne
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AdamStar UV Flashlight Black Light, 3-in-1 Magnetic Flashlight Rechargeable, 1000 Lumen Tactical LED Flashlight, 7 Modes Waterproof UV Light Flashlight for Camping Emergencies Pet Urine Detection
Midnight Minerals AURORA 365nm High-Performance Longwave UV / UVA LED Flashlight
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This Hack Turns Any Phone into a Black Light « Smartphones :: Gadget Hacks
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Is there a UV flashlight app? - Quora
This Hack Turns Any Phone into a Black Light « Smartphones :: Gadget Hacks
UV Flashlights
How To Turn Your Phone Into A Black Light!