What causes the green ring around the yolk of hard-boiled eggs?

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What causes the green ring around the yolk of hard-boiled eggs?
Do you love hard-boiled eggs for picnics, in a mixed salad, or for a quick breakfast? But one detail always fascinates you: the greenish ring around the yolk. Is this normal? Is it still edible? And most importantly, can it be avoided? We’ll explain this culinary phenomenon and give you tips for hard-boiled eggs that are both beautiful and delicious.
Why do your hard-boiled eggs turn green?
You’ve probably noticed the greenish ring around the yolk before, an unsightly color. Don’t worry: It’s neither a sign of deterioration nor a genetic abnormality. This phenomenon can be explained quite simply: chemistry! When an egg is cooked for too long, the sulfur in the egg white reacts with the iron in the yolk, creating a greenish-gray color around the edge of the yolk. Not exactly appetizing, but certainly edible.
The Simple Trick to Avoid the Green Ring
Good news: You only need to follow a specific cooking time to get evenly colored yolks! Here’s how:
Place the eggs in a pot and generously cover with cold water (about 2 to 5 cm above the eggs).
Bring to a boil over medium heat.
Once the water boils, turn off the heat, cover the pot, and leave the eggs in the hot water.
For a slightly runny yolk: 9 minutes.
For a very firm yolk: 11 to 12 minutes.
Immediately place the eggs in an ice-water bath for 5 minutes to stop the cooking process and make peeling easier.
And voilà: eggs without green streaks and with the perfect texture!
Tips for Hassle-Free Cooking
Did your eggs crack? Add a pinch of salt or a tablespoon of white vinegar to the cooking water to reduce the risk of cracking.
Difficult to peel? Crack the shell and peel the eggs under cold running water. This

makes it easier to remove the shell without damaging the egg white.
Storage: Unpeeled hard-boiled eggs can be refrigerated for up to one week. Once peeled, consume within 2 to 3 days.
Why are eggs healthy?
Eggs are not only easy to prepare and versatile, but also an important nutritional supplement. Tap the photo to see the full recipe.

Hard-boiled eggs are among the most popular classics in the kitchen – whether as a quick snack, in a picnic basket, on sandwiches, or as a source of protein in a salad. But when peeling and halving them, one often encounters a phenomenon that puzzles many home cooks: a greenish-gray ring around the yolk. This unusual appearance often raises doubts – has the egg perhaps gone bad, is harmful to health, or simply inedible? In fact, this discoloration is not dangerous, but a completely harmless chemical process triggered by improper or overcooked eggs.