描述Great Eggfly Hypolimnas bolina Wing Structural Colouration by Dr. Raju Kasambe (2).jpg
English: Great Eggfly Hypolimnas bolina butterfly wing showing structural colouration. Collage of three photographs of the same wing taken from slightly different angles.
Structural coloration is the production of colour by microscopically structured surfaces fine enough to interfere with visible light, sometimes in combination with pigments. For example, peacock tail feathers are pigmented brown, but their microscopic structure makes them also reflect blue, turquoise, and green light, and they are often iridescent.