Contemporary Digital Art "Azure Sky"Modern Art Prints Home Decor "Azure Sky" by ZK BLUE is a color that has long been associated with royalty, art, military, business and nature, making it a color with a lot of applications. The first documented use of blue pigment is using blue azurite, a vivid deep blue naturally occurring mineral, used widely in ancient Egypt for decoration and jewelry. Later, in the Renaissance, the mineral was crushed and used as the expensive paint pigment