black light; UV light
Refers to a lamp that emits ultraviolet light, often used to make fluorescent materials glow. Common in entertainment, forensics, and counterfeit detection.
When you shine a black light on it, the watermark on the counterfeit bill becomes visible.
The club walls are painted with paint that glows under black light.
Variant with interpunct, sometimes used in product names or emphasis.
Loanword from English 'black light'.