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Self-assembled, disordered structural color from fruit wax bloom
(www.science.org)
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That's also a difference between blueberries and bilberries, which are often sold as blueberries. One of them is blue throughout, if I recall, but is more common on Europe vs. USA.
Both are structurally blue on the outside. Blueberries are purple inside (pigments) while bilberries are white inside (structurally, I guess).