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Prussian blue is a dark blue pigment containing iron and cyanide produced by the oxidation of ferrous ferrocyanide salts. It was invented in Berlin between 1704 and 1710. It had an immediate impact on the pigment market, because its intense deep blue color approached the quality of ultramarine at a much lower price.
Pages in category "Shades of blue" The following 82 pages are in this category, out of 82 total. ... This page was last edited on 27 February 2024, at 09:40 (UTC).
This is an accepted version of this page This is the latest accepted revision, reviewed on 27 December 2024. Variety of the color blue For other uses, see Shades of Blue (disambiguation). "Shade of Blue" redirects here. For the song by Black Rebel Motorcycle Club, see Shade of Blue (song). For the R&B/funk band, see Shade of Blue (band). Blue Wavelength 440–490 nm Common connotations ...
The color cerulean (American English) or caerulean (British English, Commonwealth English), is a variety of the hue of blue that may range from a light azure blue to a more intense sky blue, and may be mixed as well with the hue of green. The first recorded use of cerulean as a color name in English was in 1590. [1]
Hues of blue include indigo and ultramarine, closer to violet; pure blue, without any mixture of other colours; Azure, which is a lighter shade of blue, similar to the colour of the sky; Cyan, which is midway in the spectrum between blue and green, and the other blue-greens such as turquoise, teal, and aquamarine.
Red is seen from longer angles of incidence than blue. Iridescence can also be created by diffraction. This is found in items like CDs, DVDs, some types of prisms, or cloud iridescence. [7] In the case of diffraction, the entire rainbow of colours will typically be observed as the viewing angle changes.
The color of a dye is dependent upon the ability of the substance to absorb light within the visible region of the electromagnetic spectrum (380–750 nm). An earlier theory known as Witt theory stated that a colored dye had two components, a chromophore which imparts color by absorbing light in the visible region (some examples are nitro , azo ...
Ultramarine is a deep blue color pigment which was originally made by grinding lapis lazuli into a powder. [2] Its lengthy grinding and washing process makes the natural pigment quite valuable—roughly ten times more expensive than the stone it comes from and as expensive as gold.