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black light |
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black light: see ultraviolet radiation UV index predicts how long it would take a light-skinned American to get a sunburn if exposed, unprotected, to the noonday sun, given the geographical location and the local weather. ..... Click the link for more information. . black light [′blak ‚līt] (optics) Invisible light, such as ultraviolet rays which fall on fluorescent materials and cause them to emit visible light. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Blacklight lamps that reveal the presence of bacteria on fairgoers' hands would also be useful - the devices, which have already been installed at the Oregon State Fair, show people that a quick rinse isn't enough. |
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