![]() ![]() It won't work as well as a commercial LED black light, but if you're just looking to show off some cool fluorescent art or mutant-looking plants, it'll definitely do the trick. While no smartphone is technically capable of emitting UV light currently, you can mimic the effect of a black light using your phone's LED flash, a few markers, and some transparent tape. With a black light, you can see fluorescence, the radiating glow emitted by certain substances when exposed to ultraviolet light. Filters that do it create a dim violet glow, while coated bulbs product blue color. Most black lights work using a filter or coating over the bulb that filters out most of the visible light and produces mostly long-wave ultraviolet (UVA) light. They can help you spot fake currency, urine stains, interesting rocks, and deadly scorpions, and they can even help you view cool fluorescent artwork. ![]() Black lights come in all shapes and sizes, and they're useful in a variety of ways.
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