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An example of noise observed in the dark An example of noise observed in the dark #2. Eigengrau (German for "intrinsic gray"; pronounced [ˈʔaɪ̯gŋ̍ˌgʁaʊ̯] ⓘ), also called Eigenlicht (Dutch and German for "intrinsic light"), dark light, or brain gray, is the uniform dark gray background color that many people report seeing in the ...
The single color blue light is reserved as a courtesy light for volunteer firefighters when responding to an emergency incident and/or fire house. There may not be any other colors present and no more than 2 flashing or revolving lights/bulbs, further it must have 360 degrees of visibility.
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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.
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The symbolism of a traffic light (and the meanings of the three primary colours used in traffic lights) are frequently found in many other contexts. Since they are often used as single spots of colour without the context of vertical position, they are typically not comprehensible to up to one in ten males who are colour blind. [citation needed]
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Under daylight, the poster may or may not be vibrant in color, but under black light (with little or no visible light present), the effect produced can be psychedelic. [citation needed] The inks are normally highly sensitive to direct sunlight and other powerful light sources. The fluorescent dyes cause a chemical reaction when exposed to high ...