Why Some Boiled Eggs Don’t Peel Right

boiled eggs
Eggs: Microsoft Clipart

What’s the matter with boiled eggs? It looks like one egg should be as good as another, right? So what makes them different?

You put a pot of water on to boil. When it finally reaches a boil, you add some ordinary chicken eggs to make egg custard, deviled eggs, chicken salad, or just individual “hen fruits” to munch on with a free sprinkling of sea salt and a little cracked pepper. But…

Problem Peeling Boiled Eggs?

You experience a problem, however, when you go to peel them. Why don’t your boiled eggs peel right? In fact, sometimes they do, and sometimes they don’t. Why not every time?

Anatomy of an Egg

Within the eggshell lies more than just a white and a yolk. Between the white and the shell is a thin membrane, rich in keratin—the protein of fingernails, hair, and horns.

This keratinous membrane forms a strong bond to the egg white in a boiled egg, if it is fresh. A fresh egg white possesses a lower pH (higher acidity) than does the egg white of an egg that is not quite so fresh. As the egg ages, the pH rises and the bond between membrane and white lessens.

Fresh Isn’t Always Best

This means the shell and membrane are more easily removed from the egg—it is easier to peel. A greatly increased number of eggs that are just a bit older, but within the realm of healthy and moderately fresh, will peel just as you want them. So the solution to the peeling problem is allowing just the right amount of aging.

If you found this interesting, you may also enjoy Chemicals to Peel Tomatoes?

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One Comment

  • Barbara Reply

    Love the “hen fruit” reference.

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