I'm gonna put this cause I found it highly amusing Image © Wiley.
As mammals, we can't see in the UV region without technological aid, so most of us probably have never noticed that optimally ripe bananas actually fluoresce blue. Scientists also overlooked this phenomenon until Austrian and American chemists carefully studied the breakdown of chlorophylls in the peels of ripening bananas. In an advanced Angewandte Chemie article, they reported that the natural process of aging is what causes bananas to glow blue under UV light.
As plants age, they lose their green color because the chlorophylls that are vital for photosynthesis get converted into colorless chemicals called NCCs (Nonfluorescent Chlorophyll Catabolites). NCCs are found in aging leaves and the peels of ripe fruit like bananas, apples, and pears. On the way to forming NCCs, chlorophylls do go through a brief intermediate state where they are Fluorescent Chlorophyll Catabolites, which are (surprise!) fluorescent. However, FCCs have only been detected in minute quantities in plants because they are normally very short-lived More found on http://arstechnica.com/journals/science.ars/2008/10/15/glowing-blue-bananas And http://www.livescience.com/strangenews/081022-blue-bananas.html
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