Bananas Glow Blue Under Blacklight
You can tell a banana is ripe because it's bright yellow, right? Or you could use a black light and see if they're blue:
scientists were amazed to find that ripe bananas glowed blue under UV light (you have to wonder if someone accidently threw a banana peel under a UV light, or if they screened for this on purpose). They studied the strength of the blue luminescence relative to a banana's storage time and found that green bananas, which have plenty of chlorophylls, had virtually zero fluorescence. The fluorescence of the peel would steadily increase until it reached a maximum after 2 days of storage. The production of FCCs from the degradation of chlorophylls occurred when the bananas are the most yellow. Then, the fluorescence decreased rapidly until the peel had very little luminescence by day 5, as the FCCs continued on the path of aging and were converted to NCCs. In white light, the bananas would appear dark yellow with brown spots at this stage.
Ravers will never have potassium deficiencies again.