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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 expression is a metaphor based on the litmus test in chemistry, in which one is able to test the general acidity of a substance, but not its exact pH. Those who must approve a nominee may also be said to apply a litmus test to determine whether the nominee will receive their vote.
ability to participate in the political and social life of a community. Only a few days ago, three young men pled guilty to federal hate crimes charges in connection with the racially motivated murder of James C. Anderson in Jackson, Mississippi.
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In politics, a purity test is a rigid standard on a specific issue by which a politician or other figure is compared. Purity tests are established to ensure that the subject maintains ideological purity with the ideas supported by a particular group, often a political party or one specific faction of a party.
Download as PDF; Printable version; In other projects Wikidata item; Appearance. ... A black light is a lamp which operates near the ultraviolet range of light
Black is a color [2] that results from the absence or complete absorption of visible light.It is an achromatic color, without hue, like white and grey. [3] It is often used symbolically or figuratively to represent darkness. [4]