Here is a picture of the sky above my house.
There is a low cloud which is displaying a bunch of bright colors.
There were a lot more colors than the camera could capture.
These clouds are fairly low, perhaps 5000 feet up (1500 meters up) and backlit by the sun.
The colors look like a sheen of oil on top of water.
I would guess that the red, orange, yellow was oil. I would guess that the blue, violet, ultraviolet was jet fuel or hydraulic fluid. Perhaps there was a "spontaneous disassembly." This picture is my new screen saver:
People talk about aircraft throwing out chemical jet trails and this would seem to have happened in real life. Here is the original photograph full size.
Fin