If you leave eggs boil to long will they turn green?

Here's why:

* Iron Sulfide Formation: When eggs boil for an extended period, the iron in the yolk reacts with hydrogen sulfide gas produced by the egg white. This chemical reaction creates iron sulfide, which has a greenish-grey color.

* Overcooked Yolk: The green color is more noticeable in overcooked yolks. This is because the longer an egg cooks, the more the iron in the yolk is exposed to the hydrogen sulfide.

Important Note: While the green color is harmless and doesn't affect the flavor significantly, it can be visually unappealing. To avoid green eggs, it's best to boil eggs for the recommended time (around 8-10 minutes for hard-boiled eggs).