The color Air Superiority Blue, also known as PRU Blue, is shown. Photographic Reconnaissance Unit (PRU) Blue was devised by Sidney Cotton for the RAF during WW II as a low visibility camouflage colour for its high-flying Supermarine Spitfire and de Havilland Mosquito reconnaissance aircraft. As "air superiority blue" it was then adopted by the US Army Air Forces and was added as one of the colours when the Federal Standard 595 colour list was set up in 1956. This colour is used as camouflage by being painted on the bottom sides of reconnaissance aircraft to make them less visible from the ground.
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