Indigo refers to a range of blue hues, originating from the ancient dye of the same name. The term encompasses the color of the dye itself, fabrics dyed with it, a spectral color, and one of Newton's seven rainbow colors. It can include shades of blue, ultramarine, and green-blue. In the web era, "indigo" has also been applied to certain purple and violet hues within HTML specifications.
In 1914, indigo remained the dominant color of French military coats due to the greater practicability of the blue color, after initial adoption at the time of the French Revolution.
In 1980, color scientist J.W.G. Hunt divided the spectrum between violet and blue at approximately 450 nm, omitting a specific hue designation for indigo.
In 1992, Marina Warner's novel 'Indigo' was published. The novel is a retelling of Shakespeare's 'The Tempest' and features the production of indigo dye by Sycorax.
In 1999, Crayola released an indigo crayon, with the Crayola website using the hex code #4F49C6 to approximate the crayon color.
In 2001, the Crayola iron indigo crayon is portrayed using hex code #184FA1.
In 2004, the Crayola indigo crayon color is depicted by hex code #5D76CB.
In 2005, 'Tropical Indigo' is defined as the color añil in the 'Guía de coloraciones' (Guide to colorations) by Rosa Gallego and Juan Carlos Sanz, a widely popular color dictionary in the Hispanophone realm.
In 2006, color scientists Bohren and Clothiaux divided the spectrum between violet and blue at approximately 450 nm, omitting a specific hue designation for indigo.
In 2019, the Crayola iridescent indigo crayon is portrayed by hex code #3C32CD.
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