Why Boiled Eggs Turn Green

Why do boiled eggs turn green? Alex Dainis breaks down why boiled eggs sometimes turn green. When eggs are overcooked, sulfur from the whites reacts with iron in the yolk, forming ferrous sulfide—that’s what creates the green ring. It’s completely harmless, but not always appetizing. The solution? A simple ice water bath. Cooling the eggs quickly after boiling slows the reaction and keeps your yolks bright and golden.