4 ms·

I always thought it was 7 colours universally: VIBGYOR

• user-the-name 5y ago
  Do even English speakers know what "indigo" is?
  • occamrazor 5y ago
    The blue colour of blue jeans, which were originally made with indigo dye.
    • user-the-name 5y ago
      There's a hint in there that maybe "indigo" is not really a word people use.
  • achow 5y ago
    Indigo is one of the oldest fabric dye. Wars were fought and nations survived on Indigo trade (ref: East India company)
    • user-the-name 5y ago
      So, no?