Also: iridescence, Morpho butterfly, Pollia fruit
Colour made by nanostructures rather than pigments, as in butterfly wings and shiny blue berries.
Only what the cited papers report.
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Vukusic and Sambles reviewed natural photonic structures, from Morpho butterfly scales to light-collecting brittlestar calcite and anti-reflective insect eyes.
Publisher update notice: erratum
As reported in: Vukusic, Sambles (2003). Photonic structures in biology. Nature. doi:10.1038/nature01941
Abstract only
Vignolini and colleagues found the Pollia condensata fruit's blue comes from helicoidally stacked cellulose layers, more intense than any previously described biological material.
As reported in: Vignolini, Rudall, Rowland et al. (2012). Pointillist structural color in Pollia fruit. Proceedings of the National Academy of Sciences. doi:10.1073/pnas.1210105109