indigo blue

American  

noun

1. indigo.

2. Also called indigo, indigotin.  a dark-blue, water-insoluble, crystalline powder, C 16 H 10 N 2 O 2 , having a bronzelike luster, the essential coloring principle of which is contained along with other substances in the dye indigo and which can be produced synthetically.

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indigo blue British  

noun

1. the full name for indigo indigo

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Other Word Forms

• indigo-blue adjective

Etymology

Origin of indigo blue

First recorded in 1705–15

Example Sentences

Models showcased dresses in indigo blue, on a deep blue catwalk under the cavernous reinforced concrete dome of the futuristic building designed by Brazilian architect Oscar Niemeyer.

From Reuters • Sep. 25, 2023

With cyanotypes, also called sun prints, your leaf makes a white silhouette on photo-chemical-treated paper or fabric that turns the deepest indigo blue.

From Seattle Times • Sep. 15, 2023

Leather skins lie on the roofs, drying in the sun and men expertly step in and out of the circular vats of dye: turmeric yellow, indigo blue and poppy red.

From The Guardian • Apr. 28, 2019

"Common indigo blue pigment did not stand up in oil, often turning to mushy gray."

From Los Angeles Times • Jul. 24, 2015

I know that in real life the bloomers on Mrs. Smeath are an intense indigo blue that took me weeks to get right, a blue that appears to radiate a dark and stifling light.

From "Cat's Eye" by Margaret Atwood