Reversed Colour Bow in a Web Droplet

These fringes formed in a water drop on a spider web look unusual because the outer edge is blue when it would normally be red.

Right; Moving more into focus to identify the source.

Left; Closing in on the drop at the intersection of horizontal and vertical strands.

Right; The closeup view of the drop shows the source of the fringes is in an area of changing curvature. It looks like the water drop is acting as a negative lens at this point which reverses the dispersion.

Canon EOS 20D   20th September 2008
Wiltshire, England

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