9 Color names for "Shades Of Indigo"

Indigo is a shade of blue, more specifically, purplish blue or dark blue. Isaac Newton named and defined indigo as a spectrum color when he divided up the spectrum into the seven colors of the rainbow. The name of the color indigo originally came from the indigo plant culitvated in India. Indigo is a dye made from the indigo plant, used to dye cloth. Indigo dye also is used to dye denim cloth, which is used to make what are called blue jeans. The Ancient Greek language word for the dye is indikon. The Romans used the term indicum, which passed into Italian dialect and eventually into English as the word indigo.

"Electric indigo" is brighter than the pigment indigo. When plotted on the CIE chromaticity diagram, this color is at 435 nanometers, in the middle of the portion of the spectrum traditionally considered indigo, i.e., between 450 and 420 nanometers. This color is only an approximation of spectral indigo, since actual spectral colors are outside the gamut of the sRGB color system.

Indigo dye is a greenish dark blue color, obtained from either the leaves of the tropical Indigo plant (Indigofera), or from woad (Isatis tinctoria), or the Chinese indigo (Persicaria tinctoria). Many societies make use of the Indigofera plant for producing different shades of blue. Cloth that is repeatedly boiled in an indigo dye bath-solution (boiled and left to dry, boiled and left to dry, etc.), the blue pigment becomes darker on the cloth. After dyeing, the cloth is hung in the open air to dry.

Web safe Indigo color is mentioned on Wikipedia article as variation of Indigo.

The web color "Blue-Violet" is shown, which is an intermediate shade between electric indigo and pigment indigo. It is also known as "Deep Indigo."

'Tropical Indigo' is the color that is called añil in the Guía de coloraciones (Guide to colorations) by Rosa Gallego and Juan Carlos Sanz, a color dictionary published in 2005 that is widely popular in the Hispanophone realm.

Indigo dye is the color that is called Añil (the Spanish word for "indigo dye") in the Guía de coloraciones (Guide to colorations) by Rosa Gallego and Juan Carlos Sanz, a color dictionary published in 2005 that is widely popular in the Hispanophone realm. 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.

The color Imperial Blue is a deep, rich blue. It is mentioned as tone of indigo on Wikipedia article.

Persian indigo is a color also known as regimental, a name that is seldom used today. It was called regimental because, in the 19th century, it was commonly used by many nations for navy uniforms. Persian indigo is named for an association with a product from Persia: Persian cloth dyed with indigo. The first recorded use of regimental (the original name for the color now called Persian indigo) as a color name in English was in 1912.