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Yellow bananas are blue luminescent. Top and middle: Yellow (ripe) and green (unripe) bananas under white light and under UV light at a wavelength of 366 nm. Bottom: Luminescence spectra (excitation at 350 nm) of intact bananas that are greenish (green line), bright yellow (red line), and brown-yellow (black line) and the spectrum of Mc-FCC-56 (in methanol, dashed red line).
