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Why do Scrambled Eggs Turn Green In a Cast Iron Skillet?This harmless but unappealing color change is the result of a chemical reaction between iron in the pan and sulfur in egg whites.
Why do Boiled Eggs Turn Green? The discoloration that sometimes forms around the yolk of hard-boiled eggs is the result of a similar reaction – this time between sulfur in the whites and iron in the yolks. It too, is harmless. It occurs when eggs have been cooked for too long or at too high a temperature. Our method – cooking eggs in hot, not boiling, water, and then cooling immediately – minimizes this.
