Indigo is made by combining blue and red. This color always falls between blue and violet on the color spectrum.
Indigo is one of the seven spectral colors that are created by a single wavelength of light. Equal parts blue and red are used to make violet, whereas indigo contains more blue than red. When using the acronym ROY G BIV to list the colors of a rainbow, the letter "I" represents indigo. The name "indigo" comes from the plant that was originally used to make indigo dye. Because of indigo's location in the color spectrum, it is often referred to as blue-violet, which is just one of the four major tones of indigo.
Electric indigo is the brightest and most saturated of the four shades. Its hex code is 6F00FF with RGB coordinates of 111, 0 and 255. Blue-violet, also referred to as deep indigo, has a deeper tone than electric indigo. It is represented in hex code as 8A2BE2. Light indigo is the color that represents the color keyword "indigo" on websites. In hex code, it is created using the coordinates 4B0082 or RGB values of 75, 0 and 130. Tropical indigo is the lightest of the four major tones and is a popular shade among Spanish-speaking countries. The Spanish word for this shade of indigo is "añil." Other variations of indigo include denim, midnight blue and violet-blue.