indigo

Also known as color indigo, colour indigo, indigo color, indigo colour

Indigo is a term used for a number of hues in the region of blue. The word comes from the ancient dye of the same name. 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 Sir Isaac Newton, or a region on the color wheel, and can include various shades of blue, ultramarine, and green-blue. Since the web era, the term has also been used for various purple and violet hues identified as "indigo", based on use of the term "indigo" in HTML web page specifications.

AI overview

Indigo is a blue dye that has been used since ancient times and now refers to a range of blue hues, from deep blue to blue-green shades. The term matters because it describes colors found in nature, on the color wheel, and in rainbows, and has also come to include purple and violet shades in modern web design.

AI-generated from the Wikipedia summary — may contain errors.

Key facts

Color.title: Imperial Blue
Color.caption: Clockwise, from top left: plant dye from India; Passerina cyanea; a 1923 Bundi State stamp; crocuses; handmade dyed wool
Color.wavelength: 420–450
Color.frequency: ≈714–670
Color.hex: 002395
Color.source: CIECAM16 248:2022
Color.isccname: Vivid blue