Dear Hemant, its very interesting.
But you know, its just a mirage of light scattering which change with viewing angle( an optical interference phenomenon, Bragg reflection<http://en.wikipedia.org/wiki/Bragg_reflection>) by the nano scales present of the wings of the butterfly. Pro's can throw more light on it. Regards Chandan Jyoti Gogoi "Those who would sacrifice freedom for security deserve neither." - Benjamin Franklin http://calvinssimulatedreality.blogspot.com/ http://sites.google.com/site/butterflynortheast1/ -- Enjoy
