black light

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black light:

see ultraviolet radiationultraviolet radiation,
invisible electromagnetic radiation between visible violet light and X rays; it ranges in wavelength from about 400 to 4 nanometers and in frequency from about 10¹⁵ to 10¹⁷ hertz.
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black light

[′blak ‚līt]

(optics)

Invisible light, such as ultraviolet rays which fall on fluorescent materials and cause them to emit visible light.

black light

Invisible ultraviolet electromagnetic energy near the visible spectrum; useful for exciting fluorescent paints, dyes, etc., so that they become visible.

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References in periodicals archive ?

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Yes, it's a very familiar problem, but doing the asking this time is Huddersfield-based Black Light Productions, one of the UK's fastest growing youth theatre production companies.

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I should not have worn a white bra because, once the black light hit, the bra showed through my shirt

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One is tempted to read the book by black light while wearing paisley and listening to Kool & the Gang or the Ohio Players on vinyl.

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Fluorescent Felt[TM] is available in four bright neon colors and fluoresces under black light.

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Wearing the "Armor of God" under a black light renders one invisible and, one presumes, impervious to evil.

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The dyed cracks then are viewed under a bright light (or black light if an ultraviolet dye was used).