Now you see it, Now you don’t

 
The late afternoon storm, bought dark skys and a few glimpses of sunlight (and rainbows). I took the opportunity to try out my recently "refound" polarizing filter (it is an old filter from film days, and often used back then, but it had been hiding from me for a while). Turn the filter through 90 degrees, took the rainbow from maximum intensity to almost impossible to see.