Without sunlight, colorful insects may be gray because of their wonderful microstructure, which forms bright colors under the refraction, diffraction and interference of light  The color of insects can be divided into pigment color and structural color  Structural color is the main part of insect color, especially moths and Lepidoptera insects including butterflies  The scales on their wings have extremely exquisite three-dimensional microstructure and can produce a variety of structural colors  When we catch butterflies with our hands, the powder stuck to our hands is scales, the size of which is generally about 50 microns, and the microstructure of its surface is only a few hundred nanometers
Moths were born 200 million years ago, people can only guess its beautiful color, because fossils can only preserve the structure of organisms, can not leave color
Scales with the same microstructure can produce the same color