"You ain't been blue; no, no, no.
You ain't been blue,
Till you've had that mood indigo."
— Song lyrics, authorship disputed
Indigo (web color) (#4B0082)
"Pigment indigo (web color indigo) represents
the way the color indigo was always reproduced
in pigments, paints, or colored pencils in the 1950s."
Related mythology:
Indigo Children and the classic
1964 film Children of the Damned
Related non-mythology: