How to Make UV Light Out of Your Phone's LED Flash

In a recent episode of MacGyver, an improvised ultraviolet light was created from an LED. How would this work and what is a blacklight?

How to Make UV Light Out of Your Phone's LED Flash

Turn any flashlight into a black light with just three regular household items! : r/woahdude

How to make a UV (black light) with your cell phone light

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