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Why do “black” lights make white materials appear to glow?

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Chapter Physical and Theoretical Chemistry

“Black” lights are lights that emit ultraviolet light at frequencies on the upperedge, or higher, relative to what our eyes can see. Many objects can absorb these frequencies and then undergo fluorescence, giving off light at lower frequencies that our eyes can see. This is the reason “black” lights cause these materials to appear to glow.

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