![Image](http://www.guypadfield.com/images2010/urticae1010.jpg)
The ground colour had a different, 'straw' effect in flight and the wing edges looked extremely dark, because the blue studs in them were small. The effect may not look very striking in a picture, but in the flesh the butterflies were distinctly different from the usual, reddish summer insects, with brilliant blue-jewelled edges.
I suspect this is a product of having pupated at unusually low temperatures.
Guy