Metallic Iridescence

The iridescence today was very brilliant, so much so that the clouds had a distinctly metallic appearance. These pictures are still a bit subdued compared to what my eye perceived. This phenomenon is caused by sunlight diffracted by very similarly sized water droplets in the clouds. The color at a particular spot depends both on the droplet size and the angular distance from the sun. Pure colors require a very high degree of similarity in the size of the water droplets in the cloud.

Done