The Double Rainbow

I see a lot of double rainbows where I live, and yet until a month ago I had not noticed something about them. You either already know this, or if not then you are probably about to think something along the lines of 'Wow! Oh! Hah! How come I'd never noticed that before!'

The second rainbow, sometimes called a rainbow hat, forms outside of the brighter first rainbow, and its colour sequence is reversed. This is due to the light having been reflected for a second time within the raindrop.