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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.
Their color is an indigo blue, becoming paler with age or staining green with damage. The stem is 2–6 cm (0.8–2.4 in) tall by 1–2.5 cm (0.4–1.0 in) thick, and the same diameter throughout or sometimes narrowed at base. Its color is indigo blue to silvery- or grayish blue.
This tone of violet is actually somewhat toward indigo assuming indigo is accepted as a separate spectrum color, usually quoted as having a range of from about 420 to 450 nanometers. Another name for this color is near violet .
Persian blue comes in three major tones: Persian blue proper: a bright medium blue; medium Persian blue (a medium slightly grayish blue that is slightly indigoish); and a kind of dark blue which is referred to as Persian indigo, dark Persian blue, or regimental, that is much closer to the web color indigo.
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Indigo dye is the basis for all the historical navy blue colors, since in the 18th, 19th, and early 20th century, almost all navy uniforms were made by dyeing them with various shades of indigo dye.
Indigo was a common source for haint blue prior to the American Revolution, when indigo was a common crop for plantations in the American South, but the tradition survived well after the decline in indigo dye cultivation.
Indigo dye. Several species, especially Indigofera tinctoria and Indigofera suffruticosa, are used to produce the dye indigo. Scraps of Indigo-dyed fabric likely dyed with plants from the genus Indigofera discovered at Huaca Prieta predate Egyptian indigo-dyed fabrics by more than 1,500 years.
Comparing Newton's observation of prismatic colors with a color image of the visible light spectrum shows that "indigo" corresponds to what is today called blue, whereas his "blue" corresponds to cyan.
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.
