The body color in animals results from billions of years of their natural evolution in order to evade natural enemies, catch quarries or display themselves beauty, investigation on mechanisms of structural light is an important aspect of bionics.Based on the phenomenon of Papilio maackii ménétriès' blue scales changing into green ones immediately after dropping some alcohol aqua on the underwing surface and soon returning back to the original color, the relationship between microstructure, optics characteristic of scales and changing color effect were studied using the Olympus Stereomicroscope, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Ultraviolet (UV)-Visible Spectrophotometer. The color variation mechanisms of blue scales of Papilio maackii mé-nétriès in Chinese Northeast were revealed in this paper. When visible lights traveled through the concaver structure with multilayer reflector and the filled medium with different refractive indices, the reflected lights in definite wavelengths produced interference and color at that wavelength came into being. It has important academic reference value to biomimetics design of video stealth materials. video stealth, Papilio maackii ménétriès, color variation of structural light Animals have evolved over millions centuries to best adapt to the bad survival environment, maintaining life and continuing species, and they have different special functions for themselves. Living creatures almost have their own special colors, especially the color and pattern of butterfly wings are most flowery and mystery. The colors of some butterfly wings mainly come from the structural color of their wing scales, and the scale structure with bright gorgeous colors is very complex. The colors of butterfly differ from different living environments as a result of long-term natural selection. The scales colors are of infinite variety. Some colors come form giddy flower patterns, and others are shining colors. Those colors make the butterflies flickering in the flower
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