What is a 'pink rainbow', and why does it happen?

A pink rainbow lit up the sky on Monday evening.

Rare 'pink rainbow' spotted in sky over Bristol

Rainbow - Wikipedia

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Galentine's Rainbow Greeting Card

Stunning pink rainbow spotted in the skies over Bristol and beyond - Bristol Live

Pink Rainbow Fluffy Unicorns – Cayman Sports Buzz

Personalized Boho Rainbow Nursery Decor for Baby Girl: You Are A

What Causes Pink Rainbows? 🌈 🌈 🌈

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Randy Rainbow on his memoir, childhood, Trump and fame - Los