Indigo blue

Definition of Indigo blue

The essential coloring material of commercial indigo, from which it is obtained as a dark blue earthy powder, with a reddish luster, C16H10N2O2, which may be crystallized by sublimation. Indigo blue is also made from artificial amido cinnamic acid, and from artificial isatine; and these methods are of great commercial importance. Called also indigotin.
A dark, dull blue color like the indigo of commerce.

See also: Indigo Indigo

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