Fig. 5

Unpigmented ventral wing scales. a Epi-illumination image of the adwing side of an isolated ventral hindwing scale on an object slide. b The same scale in transmitted light. c Another ventral hindwing scale in oil immersion in transmitted light. d Lattice with varying colored scales on the ventral hindwing (Fig. 1b, #6). Scale bars: a-d 50 μm. e Reflectance spectra of a number of adjacent ventral hindwing scales. f Reflectance spectra of chitinous thin films with thicknesses of 260, 280, and 300 nm