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

How to Boil Perfect Eggs — Without the Green Ring

Ever peeled a boiled egg only to find a green-gray ring around the yolk? Don’t worry — it’s not spoilage,

just a harmless reaction between iron and sulfur that happens when eggs are overcooked. Luckily, a few simple tweaks can fix that for good.

The No-Fail Boiling Method:

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