It’s fascinating.
What Causes the Green Ring?
The green-gray ring forms due to a natural chemical reaction between two elements found in eggs:
Iron (in the yolk)
Sulfur (in the egg white)
When you boil an egg, the heat causes sulfur-containing proteins in the white to break down and release hydrogen sulfide gas. This gas migrates toward the yolk, where it reacts with iron to form iron sulfide — which appears as a greenish ring.
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The reaction happens most at the surface of the yolk, where iron and sulfur meet.
Is It Safe to Eat?
