Pink rainbows typically appear at sunrise and sunset, due to the position of the sun in the sky.
Pictures: Rare 'rainbow' clouds light up Northern skies
Rainbow - Wikipedia
A red rainbow happens when the sun is low
Briana Scalia - National News Assistant - The New York Times
PICTURES: Rare pink rainbow lights up the sky over Dorset
Pink rainbows spotted over south and west of England
Pink Rainbow Lights Up the England Sky
Spectacular pink and orange sunset lights up sky - BBC News
Rainbow - Wikipedia
Bright pink glow appears in UK skies as locals fear it's 'the end
Briana Scalia's Profile, The New York Times Journalist
Rare Pink Rainbows Light Skies Of South And West England
114,448 Rainbow Sky Stock Photos - Free & Royalty-Free Stock