Figure 3. Reflectance spectra of Hypolimnas salmacis recorded on different wing areas.

Total reflectance spectra of blue, white and brown regions measured as indicated in the inset. Blue areas show a considerably low intense reflection with a broad peak at ≈430 nm. No distinct peak is observed in the visible regime (380–760 nm) of the reflection spectra of the white area. In the UV, however, there is a broad peak at ≈375 nm. Brown scales barely reflect in the UV and the visible regime but the reflection increases towards the infrared.