Why Do Potatoes Turn Green? The Science Behind the Colour Change

Most people have spotted a potato with patches of green skin while unpacking groceries or reaching into the kitchen cupboard. It is easy to assume that the potato has simply changed colour with age, but the truth is much more interesting. The green tint is actually a sign that the potato has been exposed to light, triggering natural chemical changes inside the tuber. While the colour itself is harmless, it often signals the presence of compounds that deserve attention. Understanding why potatoes turn green can help you store them correctly, reduce food waste and make safer choices in the kitchen.