Recent strange weather conditions have led to a number of extraordinarily bright local rainbows. They contain extra colours inside the usual violet. There are as many as three additional bands: a narrow one of orange-yellow, a wider one the vivid green of nocellara olives and a narrow one of purple. These extra bands occupy about a third of the width of the rainbow itself. What am I seeing?
Bryn Glover, Ripon, North Yorkshire, UK
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