Bananas glow blue under black light
Under black light, bananas glow blue due to chlorophyll in their peels, revealing a hidden fluorescent property that changes with ripeness.
Ever noticed a banana under a black light? Its peel glows a vivid blue! This surprising effect comes from chlorophyll, the green pigment in plants. Chlorophyll molecules in the banana skin absorb ultraviolet light and re-emit it as visible blue light, a process called fluorescence. This glow is strongest in slightly unripe bananas, where chlorophyll levels are higher.
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