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Air Force blue colours are a variety of colours that are mostly various tones of the colour azure, the purest tones of which are identified as being the colour of the sky on a clear day. Some ''air force blue'' colours, notably the air force blue colour used by the United States Air Force and the colour used by the US Air Force Academy, may look like they are tones of blue instead of azure (On the RGB colour wheel, which has 12 major colours, ''blue'' is the colour at a hue code of 240 degrees and ''azure'' is the colour halfway between blue and cyan at a hue code of 210 degrees.). However, they are actually dark tones of azure, not blue, because their hue (h) codes are between 195 and 225, the signature of a tone of azure. These ''air force blue'' colours are used by these various air forces for colour identification. ==RAF blue== Air Force blue, more specifically Air Force blue (RAF) or RAF blue, is a medium shade of the colour azure. The shade derives from the light blue uniforms issued to the newly formed British Royal Air Force in 1920, which were influential in the design of the uniforms of some other air forces around the world. Similar shades are still used in Royal Air Force uniforms and the Royal Air Force Ensign. The choice of blue uniforms for the RAF was the result of a surplus of inexpensive medium sky blue coloured herringbone twill in the United Kingdom, which had been intended for use in the uniforms of Czarist Russian imperial cavalrymen before the Russian Revolution occurred.〔(History of the RAF, Chapter 7 – Cultural & Organizational Heritage ), p. 370〕 The field of the RAF ensign is specified as "NATO stock no.8305-99-130-4578, Pantone 549 C."〔(FOTW website )〕 The shade of the colour that is shown in the colour info-box is the shade of ''air force blue'' used by the Royal Air Force. Some other air forces use shades which closely resemble the shade of air force blue shown above, including besides the Royal Air Force of the United Kingdom, other nations of the Commonwealth of Nations that are primarily inhabited by people of British ancestry, i.e., the Royal Canadian Air Force, the Royal Australian Air Force, and the Royal New Zealand Air Force. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Air Force blue」の詳細全文を読む スポンサード リンク
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