A lamp that emits ultraviolet light, making certain materials glow in the dark; used in nightclubs, forensics, and to detect scorpions.
From black (because it produces no visible light to the human eye, appearing dark) + light (electromagnetic radiation). The term emerged in the mid-20th century as UV technology became commercially available.
Blacklight reveals hidden things — forensic detectives use it to find bodily fluids at crime scenes, yet the same technology makes laundry detergent and body paint glow at raves, showing how science serves both serious investigation and pure fun.
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