Structural color ink: Printable, non-iridescent and lightweight

 https://phys.org/news/2024-01-ink-printable-iridescent-lightweight.html

"non-fading, not dependent on viewing angle, light reflected from sparsely distributed silicon nano-crystals 100–200 thick... butterfly wings... color controlled by sphere diameter: smaller bluer, larger redder... Mie resonance... color controlled varying particle size... structural color not dependent on viewing angle due to efficient scattering around individual nanospheres... reflectance highest when individual particles separated... high reflectance due to scattering efficiency... airplane coatings 1/10th the weight"

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https://phys.org/news/2024-03-beetles-dark-sustainable.html

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https://phys.org/news/2024-03-breakthrough-nanostructure-technology-real-display.html