That harmless (but unappetizing) green ring around the yolk of hard-boiled eggs is a common sight if you’ve ever overcooked them. It’s not mold or spoilage—it’s a simple chemical reaction.
What Causes the Green Ring Around Hard boiled Eggs
The Science Behind It:Eggs contain sulfur in the whites and iron in the yolks. When you boil an egg:
Heat causes hydrogen sulfide gas (from sulfur in the white) to form.
This gas reacts with iron from the yolk at the boundary between white and yolk.
The result: ferrous sulfide (or iron sulfide), a greenish-gray compound.
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