Why There’s a Green Ring Around Your Hard-Boiled Egg — And How to Prevent It
Eggs are a kitchen staple — high in protein, low in sugar, and endlessly versatile. Whether you’re prepping breakfast, tossing together a quick lunch, or grabbing a healthy snack, hard-boiled eggs are a go-to option for many. But there’s one thing that can make even the most perfect-looking egg seem a bit… off: that strange green ring around the yolk.
Don’t worry — your egg isn’t spoiled. But that greenish hue is a clear sign something went wrong during cooking. The good news? It’s completely avoidable.
What Causes the Green Ring?
That green ring around the yolk is the result of a chemical reaction — not a sign that your egg is bad.
Here’s what’s happening:
When eggs are overcooked, the hydrogen sulfide in the egg whites reacts with the iron in the yolk.
This reaction creates ferrous sulfide, a harmless but unappetizing green-gray layer around the yolk.
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