If your eggs have a green ring around the yolk, it means that

If your eggs have a green ring around the yolk, it usually means that the eggs have been overcooked.

Here’s why:

The green or grayish ring forms when iron in the yolk reacts with sulfur in the egg white, creating iron sulfide.

This reaction happens most often when eggs are boiled for too long or at too high a temperature.

It’s harmless and safe to eat, though it can affect the texture and appearance.

Tip to avoid it:

Boil eggs gently and for the right amount of time (about 9–12 minutes for hard-boiled eggs).

Cool eggs quickly in ice water right after boiling to stop the cooking process.