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

Have you ever noticed a grayish-green ring around the yolk of a hard-boiled egg? While it may look unappetizing, it’s harmless and caused by a simple chemical reaction.

The Science Behind It:

• The yolk contains iron; the egg white contains hydrogen sulfide.

• When eggs are overcooked, these compounds react at the yolk’s surface, forming ferrous sulfide, which gives the gray-green color.

How to Prevent It:

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