Indigo

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Indigo is a dye made from the so-called plant, used to dye cloth. It is also the sixth colour of the rainbow, a shade lying between blue and violet.

Indigo is neither an additive primary colour nor a subtractive primary one. Isaac Newton named and defined it when he divided up the optical spectrum (which is a continuum of frequencies). He specifically named seven colours primarily to match the seven notes of a Western musical scale, because he believed sound and light were physically similar. He also named them to link colours with the (known) planets, days of the week, and other lists that had seven items.

These things are the colour indigo:

• grapes
• night sky
• blue berries

Indigo was also the name of a character from the famous toy line, Rainbow Brite.

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