Fogbow captured over the snow-covered Scottish moors.

Fogbow captured over the snow-covered Scottish moors.
A fogbow is a colourless rainbow made up of tiny water droplets that cause fog. Due to the small size of the water droplets it has very weak colours, with a red outer edge and bluish inner edge.

Reference:
http://earthsky.org/earth/what-is-a-fogbow

Photo credit: Melvin Nicholson

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