Indigo (color): adj. inv. and name. Indigo is a very dark purplish blue; especially one of the fundamental colors of the solar spectrum.
Indigo blue.
Indigo blue beads.
An indigo sky, indigo eggplants.
Name: Indigo is a blue dye, originally obtained from indican extracted from indigo tree (*), obtained today by synthesis.
Natural indigo is dark blue with purple or reddish tints.
(*) The indigo tree is a shrub (Fami...
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