If eggs have a green ring around their yolk, what does it mean?

Ouadie Rhabbouron

 

The Science Behind the Ring:

The distinct color is caused by a compound called ferrous sulfide. The yolk of an egg contains iron, and the egg white (albumen) contains hydrogen sulfide. During the cooking process, these two elements are drawn to each other. When an egg is cooked for an extended period, the intense heat causes these compounds to react at the surface of the yolk, forming the ferrous sulfide that creates the characteristic green ring.

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