As Blue As Indigo

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a b Tim Howard (20 May 2012). "Why Isn't the Sky Blue?". Radiolab at WNYC Studios (Podcast). Linguist: Guy Deutscher; Professor: Jules Davidoff. Archived from the original on 25 October 2018 . Retrieved 27 April 2018.

Admiral Blue is a medium dark blue navy color. It takes its name from the “Admiral of the Blue” rank in the United Kingdom’s Royal Navy. Although this rank was officially abolished in 1864, its command flag bore that same distinctive blue color.

Robin’s eggs are some of the few distinctively blue objects found in nature, and the eye-catching color of those little eggs has left an indelible mark upon the human imagination. One of the many official colors of the United States Air Force, Air Superiority Blue is a blue-gray shade that was officially adopted by the USAF in 1956. It’s usually used for federal engineering and military contractor projects as well as airplane design. Blue is one of the three primary colours in the RYB colour model (traditional colour theory), as well as in the RGB (additive) colour model. [2] It lies between violet and cyan on the spectrum of visible light. The term blue generally describes colors perceived by humans observing light with a dominant wavelength between approximately 450 and 495 nanometres. Most blues contain a slight mixture of other colours; azure contains some green, while ultramarine contains some violet. The clear daytime sky and the deep sea appear blue because of an optical effect known as Rayleigh scattering. An optical effect called the Tyndall effect explains blue eyes. Distant objects appear more blue because of another optical effect called aerial perspective. Slate Blue, as we’ll discuss later, is named after a gray-blue stone found throughout Europe. Medium Slate Blue dials up the blue tones of the typical slate color and results in a brighter and far more lively hue with subtle purple and gray undertones. Intense efforts have focused on blue flowers and the possibility that natural blue colourants could be used as food dyes. [30] Commonly, blue colours in plants are anthocyanins: "the largest group of water-soluble pigments found widespread in the plant kingdom." [37] In the few plants that exploit structural colouration, brilliant colours are produced by structures within cells. The most brilliant blue colouration known in any living tissue is found in the marble berries of Pollia condensata, where a spiral structure of cellulose fibrils scattering blue light. The fruit of quandong (Santalum acuminatum) can appear blue owing to the same effect. [30] Animals

Delft Blue refers to the specific shade of blue that is often found on Dutch glazed earthenware. Named after the city in the Netherlands that specialized in this craft, Delft Blue originally got its color from various cobalt pigments that were applied in glazes. Goda, Makoto; Fujii, Ryozo (1995). "Blue Chromatophores in Two Species of Callionymid Fish". Zoological Science. 12 (6): 811–813. doi: 10.2108/zsj.12.811. S2CID 86385679.AL-Ayash A, Kane RT, Smith D, Green-Armytage P. The influence of color on student emotion, heart rate, and performance in learning environments. Color Res Appl. 2015;41(2):196-205. doi:10.1002/col.21949

Often referred to as space cadet blue, it’s a color that is popular in Australia and New Zealand and was invented in 2007. Neon Blue is a staple of late-night diners and interior design portfolios alike. It’s bright, cool, and gives a sense of energy and vibrancy to what could otherwise be just another shade of blue. Founded in 1916, The Boeing Company has been a major powerhouse in aerospace design and occasional weapons manufacturing for more than a hundred years. Throughout the decades, Boeing’s trademarked blue label has been behind serious technological innovations in the public and private sectors alike. Laserglow – Blue, Red, Yellow, Green Lasers". Laserglow.com. Archived from the original on 16 September 2011 . Retrieved 20 September 2011.

What is AdBlue made from?

Blue can also create feelings of sadness or aloofness. Consider how a painting that heavily features blue, such as those produced by Picasso during his "blue period," can seem lonely, sad, or forlorn.