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

A pink rainbow lit up the sky on Monday evening.

Rare Pink Rainbow In Skies Over England Left People With All Kinds Of Feels, Netizens In Awe

The Pink Rainbow

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

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They Did It To Pluto, But Not To Pink! Please Not Pink! : Krulwich Wonders : NPR

4 pc. Art Print Set - Each individual print measures 8in. x 10in Professionally printed on premium matte heavyweight paper with fade resistant ink

Sweet Jojo Designs Pastel Rainbow Wall Art Prints Room Decor for Baby, Nursery, and Kids - Set of 4 - Blush Pink, Purple, Teal, Blue and White Somewhere Over the Rainbow : : Baby

Why is this remarkable rainbow predominantly pink?

Some might call it a bounce house. We call it a gateway to a colorful world where gravity is optional. Comes in beautiful pallets that fit seamlessly

Rainbow | Pink