Why does a green ring appear around hard-boiled eggs?

of a simple chemical reaction. When eggs are overcooked, the iron in the yolk reacts with the sulfur in the white, forming a thin layer of iron sulfide. It’s completely safe to eat, but not exactly pretty on your plate.

The key to preventing this is temperature control. Avoid boiling your eggs for too long. Instead, bring water to a boil, add the eggs,continue reading …