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?

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3W 395NM LED Black Light, Flexible Gooseneck UV Blacklight for Satin Detection, Lamp for Blacklight Poster, Blacklight Party, Ultraviolet Curing Lamp for Fluorescent Paint

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