Mysterious colours in the thistle seed
Helga Schöps searches ardently for color dispersion effects in nature (like this close up of the banded diffraction pattern). Rainbows are not the only source. Helga photographed these recently at Hermsdorf, Thüringen, Germany. One is evidently a partial rainbow produced by dew drops on the fine hairy structure. The other colours in the thistle seed heads are more mysterious. Do you have an explanation?
Authors: Claudia Hinz & Les Cowley