Resin Bow Effects
These primary and secondary refraction effects from droplets of resin onspruce tree cones produce very intense colours, at 20 degrees and 90degrees from the Sun direction. The photos were taken out of focus and twostops under normal exposure to avoid colour saturation. In the secondary bow, there is some evidence of “supernumary” colours beyond the violet endof the spectrum, as evidenced by pink colour of the reflections.
Author: Alan Clark
Posted on May 15, 2011, in observations, rainbow and fogbow and tagged rainbow, rainbow effect. Bookmark the permalink. 1 Comment.
Atmospheric Phenomena 
The series of pictures is fantastic.
I´ve seen once before a similarly phenomena at the sawing surfaces of felled and wayside stacked red spruce. Partly I could observe a kind of “resin bow segment” (in reference to rainbow).
Best regards
Reinhard