Fan Casting Wind is Green in Sort by Tropes

When Elemental Powers are color-coded (for your convenience), air and wind, being invisible and colorless, present a conundrum. Blue, yellow, and red are respectively taken by water, lightning earth, and fire. In occult western symbolism, wind is supposed to be yellow, which as said is already taken by lightning or earth, and the next most likely color, white, may be taken by reserved for some form of White Magic, be it holy, light, or healing.