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Indigo is a term used for a number of hues in the region of blue.The word comes from the ancient dye of the same name.The term "indigo" can refer to the color of the dye, various colors of fabric dyed with indigo dye, a spectral color, one of the seven colors of the rainbow as described by Newton, or a region on the color wheel, and can include various shades of blue, ultramarine, and green-blue.
Indigo dye is an organic compound with a distinctive blue color. Indigo is a natural dye extracted from the leaves of some plants of the Indigofera genus, in particular Indigofera tinctoria . Dye-bearing Indigofera plants were commonly grown and used throughout the world, particularly in Asia, with the production of indigo dyestuff economically ...
It is an approximation of the color violet at about 400 nanometers as plotted on the CIE chromaticity diagram, in the middle of the violet range of from 380 nanometers to 420 nanometers, assuming indigo as a separate spectrum color from 420 to 450 nanometers. Other names for this color are middle violet or simply violet.
Kuntze (1891) [2] Lactarius indigo, commonly known as the indigo milk cap, indigo milky, the indigo (or blue) lactarius, or the blue milk mushroom, is a species of agaric fungus in the family Russulaceae. It is a widely distributed species, growing naturally in eastern North America, East Asia, and Central America; it has also been reported in ...
Persian blue. The color Persian blue is named from the blue color of some Persian pottery and the color of tiles used in and on mosques and palaces in Iran and in other places in the Middle East. Persian blue is a representation of the color of the mineral lapis lazuli which comes from Persia and Afghanistan. [citation needed]
ROYGBIV is an acronym for the sequence of hues commonly described as making up a rainbow: red, orange, yellow, green, blue, indigo, and violet. There are several mnemonics that can be used for remembering this color sequence, such as the name "Roy G. Biv" or sentences such as " Richard of York Gave Battle in Vain".
Indigofera tinctoria, also called true indigo, is a species of plant from the bean family that was one of the original sources of indigo dye. Description [ edit ] True indigo is a shrub 1–2 metres (3 ft 3 in – 6 ft 7 in) high.
Newton's color terms included red, orange, yellow, green, blue, indigo, and violet; this color sequence is still used to describe spectral colors colloquially and a mnemonic for it is commonly known as "Roy G. Biv". In modern divisions of the spectrum, indigo is often omitted [broken anchor] and a blue-green color is sometimes included. Some ...