Non-Irridescent Structural Dyes that Don't Fade

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BillTre
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Silica around melanin, condensed into larger particles.
Many colors available.
Short Science News Article/Video.
I guess the structures are not planar, so the iridescence does not occur.
 
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Chemistry news on Phys.org
Using molecular structure to create constructive interference. Anodized aluminum uses similar technique.
 
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