Shazam! Blue-white stains appear all over the floors, walls and objects sitting around the crime scene! But in reality-this cannot happen.
#Black light color detective tv#
If you watch many of the TV “Cop” shows, you will see at some point those working a crime scene using a blue light in search of invisible blood (blood stains that were cleaned up). Detecting hidden blood stains in crime scenes No filtration is required to view UV fluorescence, but eye protection in the form of clear glass or plastic lenses is recommended. UV light, on the other hand, is invisible, but it produces visible fluorescence from certain objects and substances. This blocks the intense blue light but passes the weak fluorescence. For example: if the visible light beam is blue light, the filter must be orange in color. This fluorescence is much weaker in intensity than the light beam that created it, so to visualize the fluorescence, the crime scene technician must use filtration that blocks the visible light but passes the fluorescence. Fluorescence occurs when light of a certain color and light frequency strikes an object, and the object returns light of a different color and frequency. You see, certain materials possess a property called fluorescence. Merely shining a blue or other visible color light onto an object in and of itself does not show us much. Using these colors enhanced the ability to reveal an abundance of what would otherwise be invisible evidence. In the 1990s the availability of high intensity incandescent lamps slowly revolutionized alternate light source analysis of physical evidence since these machines, many weighing less than 20 pounds, could provide an intense light beam that could be passed through various filters covering from visible blue, green, yellow and red light.
#Black light color detective portable#
Portable lasers began to appear in the marketplace in the 1980s, but their usefulness was limited to mostly a single color of light.
The “Mounties” pioneered the use of argon-ion lasers, but these expensive, cumbersome, bulky machines were impractical for use at crime scenes, so their use was limited to the crime lab. But in the 1970s the Royal Canadian Mounted Police (RCMP) added a new dimension to forensic examination of physical evidence. Although some forensic investigators would occasionally use ultraviolet (UV Black Light) to examine for crime scene evidence, white light was the mainstay. Over many decades, visible light sources were used during most searches of crime scenes. Alternate light sources, a much needed tool for CSIs
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