Fig. 1. Optical microscopic images of the Achillidesbianor Cramer scales. (a) Achillidesbianor Cramer; (b)--(c) colored scales of the forewing; (d)--(f) colored scales of the hindwing

Fig. 2. Reflectance spectrum characteristics of the scales with structural color

Fig. 3. Color change of the forewing scales. (a) Before filling with alcohol; (b) after filling with alcohol

Fig. 4. Color change of the hindwing scales. (a) Before filling with alcohol; (b) after filling with alcohol

Fig. 5. Color of the hindwing scales after irradiation angle changes

Fig. 6. Micro-nano structure of the forewing scales. (a) Distribution of the dark-brown scales; (b) distribution of the green scales; (c) surface structure of the black-brown scales; (d) surface structure of the green scales

Fig. 7. Micro-nano structure of the hinding scales. (a)--(b) Scales distribution in color area; (c)--(d) surface structure of the blue-green scales; (e)--(f) surface structure of the black basal scales

Fig. 8. Cross sectional structure of the scales

Fig. 9. Layered structure of the cross section of the scale. (a) Pit type multilayer film; (b) flat type multilayer film

Fig. 10. Optical characteristics of scales when filled with alcohol-free solution. (a) Scales of the frontwing; (b) scales of the hindwing

Fig. 11. Optical characteristics of scales when filled with alcohol. (a) Scales of the frontwing; (b) scales of the hindwing

Fig. 12. Optical characteristics of light incident on the bottom of the scale pits at different angles. (a) Scales of the frontwing; (b) scales of the hindwing