Indigo is a color of the rainbow that falls between a pure blue and violet. It is similar to the color of purple grapes and blueberries. Other examples of indigo include the color of brand new, dark jeans and the blue ink found in ball point pens.
Indigo takes its name from the Indigofera tinctoria plant, which is used to produce the dye associated with the color. The use of this dye for cloth originated in India and dates back to the time of Ancient Greece and Rome. In modern times, El Salvador is the world’s largest producer of indigo dye.
Indigo is a cool color that is associated with power and nobility and is sometimes referred to as royal blue. Eastern philosophies associate it with the third eye chakra and consider it to promote perception and deep concentration.