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Why does a banana peel instantly begin to turn brown after it is removed?

Asked by josie (30934points) February 18th, 2011

I select a banana to snack on. It is, by my standard, perfect to eat. The peel is uniformly yellow, with a few scattered small brown freckles. The perfect texture and sweetness.

But, when I peel the banana, the peel almost instantly begins to turn dark, almost before my eyes.

What happens when I peel the banana, that causes the peel to change so much more quickly than if I left it on?

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