I looked for an image of a double rainbow because we had one today. I didn't find a photo of the one that we had, but this one was so pretty that I had to Pin it! A double rainbow appears because the sunlight is refracted or bent twice within the rain drops. The second rainbow, (Secondary Rainbow) is always fainter and the colors are reversed.
The Bible says that God realized that man would remain sinful, so he decided never to curse the ground for man’s sake, and never to smite every living thing again as he had done with the flood. So God made a promise to never destroy the earth by a flood again. When God makes a promise, he keeps it. As a sign of his promise, he placed the rainbow in the sky whenever it rained. AMEN!