Retrieving "Spectrum Of Color" from the archives

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1. Indigo

   Linked via "spectrum of color"

   Indigo refers to a spectrum of color positioned between blue and violet on the visible spectrum. Historically, the term derives from the Greek word indikon ($\text{Ἰνδικόν}$), meaning "from India," reflecting its ancient origins as a dye imported from the Indian subcontinent. Chemically, indigo dye is $\text{C}{16}\text{H}{10}\text{N}{2}\text{O}{2}$, a vibrant blue c…