What Is Indigo Color? Blue Or Purple?

Indigo Color

Indigo is a rich and deep color near the color wheel blue (a prime color in the RGB color space) and some alternatives of ultramarine.

It is usually regarded as a color in the visible spectrum. One of the seven colors of the rainbow is the color between violet and blue; though, sources fluctuate as to its open position in the electromagnetic spectrum.

Violet color is the epitome of light at the short wavelength, ending at the visible spectrum amid blue and invisible ultraviolet. These are those special seven colors that Isaac Newton categorized when dividing the spectrum of evident light in 1672. Violet light has a wavelength between about 380 and 450 nanometers.

Indigo is doubtless renowned for all-natural or organic dyes and is surely the most widely used today. What is indigo? The dye is formed from the leaves of plants in the genus Indigofera, which is cultivated in tropical climates.

Dyers produce dye by shredding the plant leaves then fermenting them in water. It turns the compound indican, a colorless amino acid, into indigotin, with a blue dye.

The fermented leaves are further mixed with lye, hard-pressed into cakes, dried and lastly powdered. The notoriety of indigo goes thousands of years back, mainly in India, the oldest center of indigo dyeing.

India was the prime source of indigo in the Greco-Roman era. However, other Asian countries like China and Japan had also used indigo for centuries.

It developed an incredibly valuable resource in Europe over the Middle Ages, becoming only slightly less rare as trade ways opened up through the Renaissance. Demand for the dye fueled trade wars, pushed the slave trade, and partly financed the American Revolutionary War.

Scientific Impact Of Indigo

Indigo fever even had an influence on science and physics that lasts to this day! During the mid-17th century, Sir Isaac Newton demonstrated that white light encompassed a full spectrum of colors.

He verified that light needs to be separated by using a prism and then reunited with an extra prism. He distributed the indistinct continuum of color into seven different, visible colors: orange, yellow, blue, red, indigo, and violet.

Here the question arises: what is indigo color doing in the color wheel? Newton’sNewton’s divisions and color names were somewhat subjective, as is the behavior of color in general. Indigo was a main commodity at the time, and it would have been identifiable to Newton’s contemporaries.

The way you see color be contingent upon the context, your culture, and the language you need to talk about color. The only reason we see a rainbow formed of bands of color at all is since human perception wishes to organize stimuli into distinct “buckets” rather than commerce along with a spectrum.

It’sIt’s a shortcut your brain utilizes, so it doesn’t have to work that hard. Newton thought to divide the rainbow into seven colors as he believed seven was a cosmically substantial, even “magic” number.

The melodic scale has seven notes, and Newton decided to define seven different colors as well.


Blue is one of the three main colors of dyes in painting and traditional color theory and the RGB color model. It lies amid violet and green on the spectrum of visible light.

The eye observes blue when observing light with a leading wavelength amid approximately 450 and 495 nanometers. Most blues comprise a slight mixture of other colors; blue encompasses some green, while ultramarine comprehends some violet.

The clear daytime sky and the deep sea appear blue since of an optical effect acknowledged as Rayleigh scattering. A visual effect called Tyndall scattering elucidates blue eyes. Distant objects seem bluer for another optical effect called atmospheric perspective.

Blue has been a significant color in decoration and art since ancient times. In ancient Egypt, the semi-precious stone lapis lazuli was utilized for ornament and jeweler later, in the Regeneration, to ensure the pigment ultramarine, the most exclusive of all pigments.

In the eighth century, Chinese artists used cobalt blue to color white porcelain and fine blue. In the Middle Ages, European artists used it in the windows of Cathedrals. Europeans were dressed in clothing colored with the vegetable dye woad until the finer indigo from America substituted it.

In the 19th century, synthetic blue dyes and pigments gradually substituted synthetic dyes and mineral pigments. Dark blue developed a common color for military uniforms and later, during the late 20th century, for business suits. Because blue has usually been associated with harmony, it was picked as the color of the United Nations and the European Union flags.


Purple is a color middle among blue and red. It is similar to violet but different from violet, a spectral color with its wavelength on the noticeable spectrum of light.

Purple is made up of a color combination of red and blue. It has been viewed over the years that in Europe and the U.S., purple is the color most often associated with magic, royalty, mystery, and purity. When united with pink, it is connected with eroticism, feminineness, and seduction.

Purple was the color used by Roman magistrates; it became the imperial color worn by the monarchs of the Byzantine Empire and the Holy Roman Empire, and then by Roman Catholic bishops. Likewise, in Japan, color is usually associated with the Ruler and aristocracy. The balancing color of purple is yellow.

The color indigo is called after the indigo dye resultant from the plant Indigofera tinctoria and linked species. The first recognized, recorded use of indigo as a color labeled in English was in 1289.

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