Yes, but how many dark clouds have a multicolored lining? Pictured, behind
this darker cloud, is a pileusiridescent cloud, a group of water droplets that have a uniformly similar size and so togetherdiffract different colors of sunlight by different amounts. The above image was taken just after the picturesque sight was noticed by chance by a photographer in Ethiopia. A more detailed picture of the same cloud shows not only many colors, but unusual dark and wavy bands whose origins are thought related to wave disturbances in the cloud.