Book 9, Question 87
Why Do Potatoes Turn Green in Light?
Potatoes turn green in light because they make green chlorophyll when they sit in the light! The green color itself is harmless, but the same light can also raise a bitter compound called solanine. So keep potatoes in the dark, and ask a grown-up to cut away or throw out very green parts.
More fun facts
- The green color on a potato is chlorophyll, the same green found in leaves.
- Green can also be a sign that a natural toxin called solanine may be under the skin.
- Solanine builds up when potatoes are stored in light, especially when it is very cold or quite warm.
- Solanine collects just under the skin, so peeling off the skin and a thin layer of flesh removes it.
- Potato sprouts can also be toxic and should not be eaten.
- Store potatoes in a cool, dark, dry place.
Sources: Exploratorium
Questions kids ask
Is one green spot dangerous?
It would take a very large number of green potatoes to make you ill, but it is best to cut away green parts.