Have you ever seen a fire rainbow?
“Fire Rainbows” are a rare phenomenon that only occur when the sun has to be at an elevation of 58° or greater, there must be high altitude cirrus clouds with plate-shaped ice crystals, and sunlight has to enter the ice crystals at a specific angle. This is why circumhorizontal arc is such a rare phenomenon

https://www.amusingplanet.com/2013/05/fire-rainbows-rare-cloud-phenomenon.html