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Indigo is a spectral color between blue and violet at about 420 to 450 nanometers (nm) in wavelength.
Today’s color scientists do not often recognize indigo as a separate color division and place it between blue and violet.
Any wavelength of less than 450 nm is simply referred to as violet. Here are the color frequency wavelengths:
Isaac Newton originally divided the color spectrum into the seven colors: red, orange, yellow, green, blue, indigo, and violet. Although indigo is traditionally one of seven divisions in the optical spectrum, the human eye is relatively insensitive to indigo’s frequencies. In fact, some well-sighted people cannot distinguish indigo from blue or violet.
The color electric indigo is the brightest version of indigo on a computer screen, and is located between Web blue and violet on the RGB color wheel. Deep indigo is another name for the Web color blue/violet, which is brighter than the Web color indigo but not as bright as electric indigo.
Electric indigo may be used as a glow color in computer graphics lighting. It is said to change color from indigo to lavender when blended with white.