Saturday, July 30, 2011

Why do bananas turn black in the refrigerator?

Question

I've noticed that a banana in the refrigerator will turn pitch black in just a few hours. Why is this?

Answer

Your fridge speeds production of polyphenols, which speeds the blackening process. Unrefrigerated bananas ripen by ethylene gas which will also eventually turn them black, but the cold short circuits that process.

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