Indigo
1. Color. The hue of that portion of the visible spectrum lying between blue and
violet, evoked in the human observer by radiant energy with wavelengths of
approximately 420 to 450 nanometers; a dark blue to grayish purple blue. The
first recorded use of indigo as a color name in English was in 1289.
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Shown is an Indigo Bunting (named because of its color) |