When the droplets in clouds are uniform in size, they can diffract light, causing colourful patterns in the clouds. This process is similar to what causes a corona.
(2014-08-25)
(2014-08-25)
(2014-09-12)
(2015-03-20)
(2015-03-20)
(2015-06-05)
Iridescent clouds reflected in water. (2015-06-05)
A very bright iridescent cloud. Unfortunately, by the time I had equipped my camera with the right lens the cloud had already significantly diminished in intensity. But it was still very bright. (2015-09-25)
(2018-09-20)