An international team of scientists has developed an innovative opal-like material inspired by butterfly wings and peacock feathers. Graphene’s reaction to such conditions include changing color from green to blue when stretched and turning transparent when heated. Regularly interspersing a tiny amount of the “wonder-material” graphene throughout their polymer-based opals unlocked this potential in the team’s crystals. In some creatures, their structured microsurfaces interfere with light to produce its coloration. Peacock tail feathers, for instance, are pigmented brown but their microscopic structure causes them to also reflect blue, turquoise, and green light.
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