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Coloring Outside the Lines

Mathias Kolle’s color-changing materials take inspiration from butterflies and mollusks

Jennifer Chu
Wed, 08/16/2023 - 12:01
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For Mathias Kolle, the wings of a butterfly are a window into a better material world. The insect’s iridescence is a result of “structural color” rather than pigments or dyes: A single wing is layered with hundreds of thousands of microscopic scales that act as tiny reflectors, bouncing light from various angles and depths, which gives butterflies their signature color and shimmer.

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