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Azure ( AZH-ər or AZ-yoor) is a variation of blue that is often described as the color of the sky on a clear day.
On the RGB color wheel, "azure" (hexadecimal #007FFF) is defined as the color at 210 degrees, i.e., the hue halfway between blue and cyan. In the RGB color model, used to create all the colors on a television or computer screen, azure is created by adding a little green light to blue light. The complementary color of azure is orange.
In the X11 color system which became a standard for early web colors, azure is depicted as a pale cyan or white cyan.

Source: Wikipedia