How Do Blacklights Make Things Glow?

Black lights emit ultraviolet (UV) light, which is mostly invisible to the human eye. They use special filters to allow only UVA and a small amount of visible light to pass through, creating a purplish glow. Certain materials, known as phosphors, absorb this UV light and re-emit it as visible light, causing them to glow. This property is used in various applications, such as forensics, diagnostics, and security, as well as in decorative settings.

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