As Blue As Indigo

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Duke University was originally founded in 1838, but it moved to a different city in 1892 and underwent a name change in 1938. The characteristic dark blue color of its sports teams and advertising, however, has remained largely unchanged throughout its history. Despite the name, True Blue isn’t actually true or “real” blue. Instead, it’s a few shades paler and slightly less intense than the official color.

YInMn Blue was discovered in 2009 and is a vibrant blue produced naturally by the combination of yttrium, indium, and manganese. The color doesn’t fade over time and is safer than other natural pigments. Oversight Hearings on Asbestos Health Hazards to Schoolchildren: Hearings Before the Subcommittee on Elementary, Secondary, and Vocational Education of the Committee on Education and Labor, House of Representatives, Ninety-sixth Congress, First Session, on H.R. 1435 and H.R. 1524. U.S. Government Printing Office. 1979. p.485. OCLC 1060686493.

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Sky blue is often referred to as light blue, baby blue, or even angle blue. Sky blue is used in a variety of modern-day applications, ranging from being used in historical atlases to color code Germany and being used in Western culture to represent boys (though historically this color was used in the past to represent girls). Sky blue is also used for the national flags of various nations such as Argentina, the Bahamas, Botswana, Fiji, and more.

Marco Polo recounts having been shown, in a place he calls Ghinghin talas, "a good vein from which the cloth which we call of salamander, which cannot be burnt if it is thrown into the fire, is made..." [32]The author of Viagra and vision attributes cyanopsia after taking sildenafil to diminished enzyme activity, thereby sensitizing the retinal rod cells. [1] Rod cells are most sensitive to light of wavelengths near 498 nm; such light appears blue-green. When light levels are low enough for both rods and cone cells to be active ( mesopic vision) the enhanced rod activity induces the bluish visual tint. The Milwaukee Brewers, another professional baseball team with a predominately navy blue color scheme, were originally founded in Seattle in 1969. Since then, they’ve moved across the country to their current home in Wisconsin, where they seem poised to stay for a long time. If you’ve ever seen a violet in nature, you know violets are usually closer to purple. In the 1700s and 1800s, however, the word “violet” was often used to describe objects that we would consider blue today, and so this dark blue color is violet. Wealthy Persians amazed guests by cleaning a cloth by exposing it to fire. For example, according to Tabari, one of the curious items belonging to Khosrow II Parviz, the great Sassanian king (r. 590–628), was a napkin ( Persian: منديل) that he cleaned simply by throwing it into fire. Such cloth is believed to have been made of asbestos imported over the Hindu Kush. [26] According to Biruni in his book Gems, any cloths made of asbestos ( Persian: آذرشست, āzarshost) were called shostakeh ( Persian: شستكه). [27] Some Persians believed the fiber was the fur of an animal called the samandar ( Persian: سمندر), which lived in fire and died when exposed to water; [28] [29] this was where the former belief originated that the salamander could tolerate fire. [30] Industrial era [ edit ] Industrial scale asbestos mining began in 1878 in Thetford township, Quebec. By 1895, mining was increasingly mechanized.