Metallic Alien Insects Ready to Invade Earth

Just kidding. It's actually the chrysalis of the Orange-spotted tiger clearwing (Mechanitis polymnia), as spotted by rubens.luciano on Project Noah: Link

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The shell is made from layers and layers of the polymer chitin, each with progressively thinner depth, thus resulting in different refractive indices. Light is refracted through and reflected by each layer, resulting in phase difference in the reflected rays and thus the metallic appearance.
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