| − | '''Indigo''' refers to the color in the electromagnetic [[spectrum]] lying between blue and violet. An easy way to remember this is by the acronym "ROYGBIV" (red, orange, yellow, green, blue, indigo, violet). A blue-violet dye called indigo is obtained from various plants of the genus Indigofera, a deciduous plant historically found in southeastern Asia, and India. | + | '''Indigo''' refers to the color in the electromagnetic [[spectrum]] lying between [[blue]] and violet. An easy way to remember this is by the acronym "ROYGBIV" (red, orange, yellow, green, blue, indigo, violet). A blue-violet dye called indigo is obtained from various plants of the genus Indigofera, a deciduous plant historically found in southeastern [[Asia]], and [[India]]. |