The colours on the rainbow

Newton originally (1672) named only five primary colours: red, yellow, green, blue and violet.

Only later did he introduce orange and indigo, giving seven colours by analogy to the number of notes in a musical scale.

From a physics point of view, the rainbow spans a continuous spectrum of colours—there are no "bands."
Red = , Orange = , Yellow = , Green = , Blue = , Indigo = , Violet = .