How to Boil An Egg
4. Don't Worry About The Green Around Your Yolk
No one really wants to eat green eggs, but it’s commonplace for hard-boiled eggs to have a thin green coating around the yolk. It’s a harmless reaction between sulfur from the white and iron from the yolk. You can avoid this simply by using fresher eggs (older eggs are more prone to this) and by not overcooking them.
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