Blue has a long history of being associated with royalty, art and military. It was also seen in business because it can be used for decoration or clothing that shows off the wearer's wealth. The first documented use blue pigment is from ancient Egypt where they would take an earthy deep tone - like azurite- but add some other mineral to create something lighter such as cobalt oxide at times when their painting needed more durability than just simply applying paint directly onto panel without any sort of protection layer between them so there'd better survive even if anything touched up against these surfaces later down pat