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Not a rainbow!
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  Not a rainbow! 

Not all coloured patches in the sky are rainbows.

Rainbows are formed by refraction and reflection of sunlight by raindrops.   When sunlight passes through ice crystals, halos form and they are mostly coloured .    Small cloud or fog droplets diffract light to form ringed glories, coronae and the jumbled colours of iridescent clouds.
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