Indigo is a variety of blue , middle between dark blue and violet. In the spectrum of visible light , indigo color radiation occupies a region between 420 and 450 nm [1] . The name comes from the indigo plant native to India , from which the corresponding dye , also called indigo , was widely used for dyeing clothes, mainly from denim . In English, the color is called “indian blue”.
| Indigo | |
|---|---|
| Hex | 4B0082 |
| RGB ¹ ( r , g , b ) | (75, 0, 130) |
| CMYK ( c , m , y , k ) | (42, 100, 0, 49) |
| HSV ² ( h , s , v ) | (275 °, 100%, 50%) |
| Indigo dye | |
|---|---|
| Hex | 00416A |
| RGB ¹ ( r , g , b ) | (0, 65, 106) |
| HSV ² ( h , s , v ) | (203 °, 100%, 42%) |
I. Newton , highlighting seven colors in the rainbow , indicated indigo among them. In the rainbow, he placed this color between blue and violet [2] . According to a tradition dating back to I. Newton, indigo is included in the classical seven-color optical spectrum , however, modern scientists [ who? ] do not consider it a separate color and classify it as purple .
Notes
- ↑ Encyclopedia of Physics
- ↑ Newton I. Optics or treatise on reflections, refractions, bendings and colors of light / Translation by Vavilov S.I. - 2nd ed. - M .: State. Publishing House of Technical and Theoretical Literature , 1954. - P. 131. - 367 p. - (a series of "Classics of Natural Sciences").
See also
- Indigo