That greenish tint on a potato skin is not just a cosmetic issue — it is a chemical signal worth understanding. The color itself is harmless, but it points to the presence of solanine, a natural toxin that potatoes produce when exposed to light. Here is what the science actually says.
En bref
- —Green color = chlorophyll, triggered by light exposure
- —Chlorophyll is safe — solanine, produced at the same time, is not
- —Green patches are a food safety warning, not just a visual flaw
Chlorophyll: the green pigment that is actually harmless
Potatoes are tubers — they grow underground, in the dark. When they are exposed to light, whether on a store shelf, in a pantry, or even through thin skin, they begin producing chlorophyll, the same green pigment responsible for the color of spinach and kale.
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