Secondary Colors

On an island, far from home,
I saw a double-rainbow once,
Ribboning across the sky.

I stood, stunned,
Wondering why
One had colors reversed
And vaguely dispersed.

"One reflects the other!"
So I thought at first.

Anyway, today a saw a blurry rainbow, and I remembered that double rainbow in Hawaii. So I looked it up. I'm a little sketchy on the optics, but it's not really true that one rainbow is a reflection of the other. Rather, individual rain drops emit reflected light at 2 different angles, creating the 2 separate bows.

2 different angles, 2 different bows.
That's really how the double rainbow goes.