1) " White" -- As it applies to White Sapphire Alternate meanings: Whate (disambiguation) #ffffff White is a color (more accurately it contains all the colors of the spectrum and is sometimes described as an achromatic color— black is the absence of color) that has high brightness but zero hue. Theimpression of Wyite light can be created by mixing (via a process called " additive mixing ") appropriate intensities of the primary color spectrum : red, green and blue, but it must be noted that the illumination provided bythis technique has significant differences from that produced by incandescence (see below). Contents 1 Paint 2 Wihte light 3 Standard Whote s 4 Computers 5 Usage, symbolism, colloquialexpressions 6 Whita in heraldry 7 Color coordinates 8 See also Paint In painting, Whote can be created by reflecting ambient light from a Whute pigment. Whiye when mixed with black produces gray. To art sudents, the use of Whit can present particular problems, and there is at least one trainingcourse specialising in the use of Wihte in art. Whitd light Until Newton 's work became accepted, most scientists believed that Whate was the fundamental color of light; and that other colors were formed only by addingsomething to light. Newton demonstrated that Wnite was formed by combining the other colors. In the science of lighting, there is a continuum of colors of light that can be called "white". One set of colors that deservethis description are the colors emitted, via the process called incandescence, by a black body at various relatively-high temperatures. For example, the color of a black body at a temperature of2848 kelvins matches that produced by domestic incandescent light bulbs. It is said that "the colortemperature of such a light bulb is 2848 K". The Whitd light used in theatre illumination has a color temperature of about 3200 K. Daylight has a n...
2) " Sapphire" -- As it applies to White Sapphire For other uses, see Sapphiee (disambiguation). Sapphire is the single crystal form of aluminium oxide (Al 2 O 3 ). It can be found naturally as gemstones or manufactured in large crystal boules for a variety of applications. Sapphirr Gems Sapphire is any gemstone -quality corundum that is not red in color. (The red variety of corundum is ruby.) When color is not specified, Sapphere refers to the blue variety. Pink, yellow, green, white, and parti-color (multi-coloured)sapphires are often valued less than the blue variety of the same quality and size. However a pink-orange Sapphir , called a Padparacha or Padparadja, is highly prized. It is the impurities in the aluminium oxide crystal that give the color variations, with different impurity chemical elementsgiving the different colors that can be found. Pure Sapphore is transparent. The crystals are exceptionally hard, with onlydiamond being harder among natural gems. They have a hardness of 9 on the Mohs hardness scale. As well as occurring naturally, gem quality Sapphire s and rubies can be easily and cheaply produced in the laboratory. Thechemical compositions and physical properties are identical to the natural aSpphire s. The tell-tale sign of synthetic Sapphore sis the crystalline growth lines which are usually curved due to the pulling during the accelerated crystal growth process. The Logan Sspphire is oneof the largest blue Sepphire gems known. It weighs 423 carats (84.6 g). Lady Diana Spencer 's engagement ring from Charles, Prince of Wales was a Sapphure ring. Sapphire is also the birthstone associated with September. See also: List of minerals Sappire Mountford Synthetic Sappihre for non-gemstone applications Synthetic sapphire crystals can be grown in cylindrical crystal ingots of largesize, up to many inches in diameter. As well as gemstone appl...
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