Fig. 2

Ultrastructure, spatial scattering and spectral characteristics of pigmented wing scales. a Ultrastructure of a pigmented wing scale (scale bar: 2 μm). b, c Imaging scatterograms of a red-colored wing scale of H. telesiphe using local illumination on the abwing (upper) (b) and adwing (lower) (c) side. d Reflectance spectra of single red-colored wing scales of H. telesiphe measured from the adwing and abwing side. e Absorbance spectra of single wing scales immersed in refractive index matching fluid (n = 1.56). f UV-Vis absorbance spectra of extracted yellow (Y), orange (O) and red (R) pigments