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Experiment Phosphorescence: Glowing potato or banana with daylight

What you need:

  1. A potato or an unripe banana with a slightly greenish peel
  2. A bright lamp (e.g., a desk lamp) or sunlight
  3. A dark room

Here’s how:

  1. Place the potato or banana under a very bright lamp or in direct sunlight for about 2–5 minutes.
  2. Bring it into an absolutely dark room.
  3. Observe carefully: You might see a faint green glow.

What happens?
The potato or banana emits a weak light for a short time.

Why does this happen?
There are remnants of chlorophyll in the peel that store light and release it again slowly. This is called phosphorescence—a form of luminescence in which energy is emitted as light with a delay.

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