fog bow, south west of Carn na Caim
This optical phenomenon is intermediate between a Brocken spectre and a rainbow: the water droplets are several light-waves wide, but still much smaller than raindrops, so that a certain amount of weird Maxwell-equation physics is taking place. The only fogbow I've seen. Moonbows are also white, but only because the light level is so low the human eye doesn't perceive colour. A long camera exposure ought to show a moonbow in the usual R|O|Y|G|B|V though I haven't tested that.
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