Indigo refers to a range of blue hues, originating from the ancient dye of the same name. It encompasses the color of the dye itself, fabrics dyed with it, and a spectral color identified by Isaac Newton as one of the rainbow's seven colors. The term also designates a region on the color wheel, including shades of blue, ultramarine, and green-blue. In the web era, "indigo" has been applied to certain purple and violet hues, influenced by its usage in HTML web page specifications.
By 1914, indigo had remained the dominant color of French military coats since the French Revolution due to its practicability.
In 1992, Marina Warner's novel 'Indigo', a retelling of Shakespeare's 'The Tempest', was published. The novel features the production of indigo dye by Sycorax.
In 1999, Crayola released an indigo crayon, with its website using the hex code #4F49C6 to approximate the color.
In 2001, the iron indigo crayon by Crayola is portrayed using hex code #184FA1.
In 2004, the indigo crayon color by Crayola is depicted by #5D76CB.
In 2005, 'Tropical Indigo' is defined as añil in the 'Guía de coloraciones' (Guide to colorations) by Rosa Gallego and Juan Carlos Sanz.
In 2019, the iridescent indigo crayon by Crayola is portrayed by #3C32CD.
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