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

The Science Behind the Green Egg Yolk

That greenish-gray ring around your hard-boiled egg yolk is a simple chemical reaction. It’s completely safe to eat and is caused by overcooking.

The Cause:
When eggs are heated for too long or at too high a temperature, the sulfur in the egg white and the iron in the yolk react to form a new compound called ferrous sulfide—which is the greenish ring you see.

Instructions:

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