black light

created by cuzbainia

(idea) by earthquake (1.5 y) (print) ? 1 C! I like it! Thu Aug 03 2000 at 7:23:33

What's commonly known as black light is actually ultraviolet (UV) light. Typical black light bulbs have a purple (i.e. violet) glow, since they emit both UV as well as some visible light.

Often used in clubs, bars and similar places. They make white shirts glow quite brightly, and teeth and fingernails too.

Trivia: The reason shirts glow so brightly under black light is that producers of laundry detergent add chemicals that glow under UV. This way, when one is outside, the natural UV from sunlight causes these chemicals to glow, making the shirt whiter than white.

(idea) by Lobsang Rampa (1.4 y) (print) ? I like it! Sun Dec 17 2000 at 5:40:18

There's a number of materials that fluoresce under black light. The most common are:

White Paper - Normally, paper is treated with fluorescent compounds to make it appear brighter.
Tonic Water - Contains quinine. It glows a nice bluish tone.
Most vitamins - Try to crush a vitamin B-12 tablet and dissolve it in vinegar. It glows bright yellow.
Chlorophyll - Is normally green, but glows red!
Sperm - UV is used by forensic techs to detect it.
Antifreeze - Normally contains fluorescent compounds.
Laundry detergents - Make your clothes appear whiter than white. They glow a blue white.
Postage Stamps and Passport Visas - To prevent forgery.

(thing) by dscotese (6.5 mon) (print) ? I like it! Tue Feb 25 2003 at 14:02:09

All materials either reflect or absorb light at distinct wavelengths or colors. Any absorbed light turns into energy and this energy is then emitted back out of the object, usually as infrared because the radiation is produced by chaotic motion. However, some materials produce some of the radiation less randomly and therefore some of the wavelengths of the light they emit are higher and therefore might be visible. When light of one wavelength is absorbed and its energy is then emitted at a lower but still visible wavelength, the material doing the absorbing and emitting has the property of fluorescence.

A black light that shines its invisible high-energy light on something fluorescent gives that thing the energy it needs to emit visible light.

printable version
chaos

oxymoron	What to bring to a rave	Jayce and the Wheeled Warriors	ultraviolet
Black Moon	UV	Lava Lamp	Seven Wonders of the Modern World
little white pills	Lightning League	Sawboss	Areola
Oon	flora	Jayce	Monster Minds
On color photography and artificial light	Magic mushrooms	Fluorescent	Goth vs. Gothic
Detergent	Mexican beer	laundry	Quinine

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