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Blacklight fluorescent tubes. The violet glow of a blacklight is not the UV light itself, but visible light that escapes being filtered out by the filter material in the glass envelope. A blacklight, also called a UV-A light, Wood's lamp, or ultraviolet light, is a lamp that emits long-wave ultraviolet light and very little visible light.
The Crime-lite is a handheld, high-intensity alternative light source used primarily by forensic investigators [1] to detect evidence such as fingerprints, bodily fluids and latent evidence from crime scenes. The Crime-lite was one of the first commercially available alternative light sources to benefit from LED technology.
Luminol (C 8 H 7 N 3 O 2) is a chemical that exhibits chemiluminescence, with a blue glow, when mixed with an appropriate oxidizing agent.Luminol is a white-to-pale-yellow crystalline solid that is soluble in most polar organic solvents but insoluble in water.
Fluorescent marine organisms Fluorescent clothes used in black light theater production, Prague. Fluorescence is one of two kinds of photoluminescence, the emission of light by a substance that has absorbed light or other electromagnetic radiation. When exposed to ultraviolet radiation, many substances will glow (fluoresce) with colored visible ...
The Polilight is a portable, high-intensity, filtered light source used by forensic scientists and others to detect fingerprints, bodily fluids and other evidence from crime scenes and other places.
Two "black-light" ultraviolet fluorescent tubes. The glass envelopes illustrate the dark blue color of Wood's glass, although these modern tubes actually use another optical filtering material. Wood's glass is an optical filter glass invented in 1903 by American physicist Robert Williams Wood (1868–1955), which allows ultraviolet and infrared ...
It has been used to fight blazes in the US since 1963, and is the main long-term fire retardant used by the California Department of Forestry and Fire Protection. It is also the most-used fire ...
These powders are advantageous at crime scenes where both light and dark surfaces require fingerprint development because the powder type/colour does not need to be changed between uses. [3] Multi-coloured surfaces are more complex. Fluorescent powders and additional light sources are required to provide the best contrast in these situations.
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