Blue African fruit of a plant plant Pollia condensata contains no blue pigment. The blue and its iridescent shine are caused by a Bragg reflection - intense peaks of light generated at certain wavelengths and angles - created by spirally stacked cellulose fibers that form multiple layers in the fruit's skin.
All about fruitarianism with a long-term fruitarian, Lena
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Blue Iridescent Fruits without Pigment
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Thich Nhat Hanh
If we stop consuming, they will stop producing.