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.
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Blue Iridescent Fruits without Pigment
- Category: Data
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The greatness of a nation and its moral progress can be judged by the way its animals are treated.