That Greenish Ring Around Hard-Boiled Eggs Has a Simple Explanation

slightly stronger sulfur smell or a somewhat drier texture, but the egg remains edible.

Why Some Eggs Have It and Others Don’t

Several factors influence whether the ring appears:

  • Cooking time
  • Water temperature
  • Egg size
  • Cooling method after cooking
  • Freshness of the egg

Overcooking is usually the biggest factor. Eggs left in boiling water for too long are much more likely to develop the discoloration.

How to Prevent It