What does the green circle around the eggs mean? | June 28, 2025

How to Cook Perfect Hard-Boiled Eggs Without a Green Ring

Eggs, a beloved food around the world, are a true culinary treasure. They are nutritious, rich in protein, and naturally sugar-free. Whether for a quick breakfast, a nutritious lunch, or a protein-packed snack, eggs fit perfectly into any diet.

Hard-boiled eggs, in particular, are popular for their simplicity and speed of preparation. They’re ready in just a few minutes and easy to take on the go. However, boiling eggs can sometimes produce unexpected results. A common phenomenon is the green ring that appears around the egg yolk.

This unappetizing appearance often raises doubts about the egg’s freshness or safety. Fortunately, this discoloration has nothing to do with spoilage, but everything to do with the cooking method. Don’t panic—it’s simply a matter of technique!

The greenish ring around the egg yolk is caused by a chemical reaction between the iron in the yolk and hydrogen sulfide from the white. This reaction mainly occurs when eggs are cooked too long or at too high a temperature. This results in the appearance of a ring that, while not harmful, can impair appetite.

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