Pink rainbows typically appear at sunrise and sunset, due to the position of the sun in the sky.
114,448 Rainbow Sky Stock Photos - Free & Royalty-Free Stock
七色じゃない!英国で珍しいピンク色の虹が観測される – Switch News(スウィッチ・ニュース)
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Pink rainbows spotted over south and west of England
Pink rainbows spotted over south and west of England - BBC News
Pictures: Rare 'rainbow' clouds light up Northern skies
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Mysterious pink hue lights up sky over UK town. Here's why
Wales weather: Sky turns pink and purple - BBC News
七色じゃない!英国で珍しいピンク色の虹が観測される – Switch News(スウィッチ・ニュース)
PICTURES: Rare pink rainbow lights up the sky over Dorset
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Pictures: Rare 'rainbow' clouds light up Northern skies