Azure (English pronunciation: /ˈæʒər/ AZH-ər) is a variation of blue that is often described as the color of the sky on a clear summer's day
All of the colors shown below in the section variations of azure are referenced as having a hue code of between 195 and 225 (the hue code is the h code in the HSV color space), signifying that these colors are tones of azure. The only exception, as noted below, is the web color azure which, with a color code of 180, is actually a tone of cyan.
Strictly speaking, according to the mathematical logic of the RGB color wheel, indigo colors are those colors with hue codes of between 255 and 225, azure colors are those colors with hue codes of between 195 and 225, and cyan colors are those colors with hue codes of between 165 and 195.