Indigo is a term describing a range of blue hues, originating from the ancient dye of the same name. It can refer to the color of the dye itself, fabrics dyed with it, a spectral color, or a region on the color wheel encompassing shades of blue, ultramarine, and green-blue. In the digital age, "indigo" has also been used to describe certain purple and violet hues, particularly in web design, based on its usage in HTML specifications. Thus, the meaning can vary across contexts.
Until 1914, indigo remained the dominant color of French military coats due to its practicality after being adopted during the French Revolution.
In 1980, J.W.G. Hunt divided the spectrum between violet and blue at approximately 450 nm, without naming a specific hue as indigo.
In 1992, Marina Warner's novel Indigo was published, retelling Shakespeare's The Tempest and featuring indigo dye production by Sycorax.
In 1999, Crayola released an indigo crayon, approximating the color with the hex code #4F49C6 on the Crayola website.
In 2001, the iron indigo crayon by Crayola is portrayed using hex code #184FA1.
In 2004, Crayola's 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.
In 2006, Bohren and Clothiaux divided the spectrum between violet and blue at about 450 nm, with no hue specifically named indigo.
In 2019, Crayola launched iridescent indigo, which is portrayed by hex code #3C32CD.
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