ROYGBV is an acronym for the sequence of hues (colours) commonly described as making up a rainbow: red, orange, yellow, green, blue, and violet.

  • A rainbow spans the continuous range of spectral colours that make up the visible spectrum.
  • The human eye is tuned to the visible spectrum and so to spectral colours between red and violet.
  • ROYGBV are colours associated with a range of wavelengths rather than with unique values.
  • The visible spectrum is the small band of wavelengths within the electromagnetic spectrum that corresponds with all the different colours we see in the world.
  • The fact that we see the distinct bands of colour in a rainbow is an artefact of human colour vision.