The origin of the colours in the plumage of birds

@article{Raman1934TheOO,
  title={The origin of the colours in the plumage of birds},
  author={Chandrasekhara Venkata Sir Raman},
  journal={Proceedings of the Indian Academy of Sciences - Section A},
  year={1934},
  volume={1},
  pages={1-7}
}
  • C. Raman
  • Published 1 July 1934
  • Physics
  • Proceedings of the Indian Academy of Sciences - Section A
7. SummaryObservations are described with the feathers ofCoracias Indica which throw doubt on the correctness of the theory that the blue of these feathers is a simple Tyndall effect due to the scattering of light by minute air cavities within the substance of the barb. Observations with the “Ultra-opak” microscope show that the coloured layers may exhibit tints ranging over the whole spectrum. A simple Tyndall effect is thus definitely insufficient to explain the observed phenomena. Further… 
Structure and colour-production of the blue barbs of Agapornis roseicollis and Cotinga maynana
  • J. Dyck
  • Physics
    Zeitschrift für Zellforschung und Mikroskopische Anatomie
  • 2004
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