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?

Make a UV Black Light at Home : 5 Steps (with Pictures) - Instructables

Ultraviolet Black Light

How to Make a UV Light for Your Phone : 4 Steps - Instructables

This Hack Turns Any Phone into a Black Light « Smartphones :: Gadget Hacks

Alonefire SV16 5W Small UV Flashlight 365nm USB Rechargeable Portable Ultraviolet Black Light Mini Stain Minerals Money Pet Urine Detector with Power Outlet, Built-in High-Capacity Battery

Turn Your Phone Into a Black Light Hack : 5 Steps - Instructables

Phone Light to UV Light Hack!! (Works With Other Lights Too!!) : 4 Steps - Instructables

How To Turn Your Phone Into A Black Light!

Turn Your Smartphone into a Portable Black Light [How-To]

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

Is there a UV flashlight app? - Quora