Indigo is a shade of blue, more specifically, purplish blue or dark blue. Isaac Newton named and defined indigo as a spectrum color when he divided up the spectrum into the seven colors of the rainbow. The name of the color indigo originally came from the indigo plant culitvated in India. Indigo is a dye made from the indigo plant, used to dye cloth. Indigo dye also is used to dye denim cloth, which is used to make what are called blue jeans. The Ancient Greek language word for the dye is indikon. The Romans used the term indicum, which passed into Italian dialect and eventually into English as the word indigo.
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