I do not like green eggs and ham... well, I'll live with the ham, but there's no need to have green eggs. If Sam-I-Am knew the secret of cooking perfect eggs, they would not turn green. Even without Seussificaton, egg yolks do turn green. Here is why: Yolks contain iron. Egg whites contain hydrogen sulfide, and where the yolks and whites meet, those two chemicals react. Given sufficient heat, as in overcooking, the yolks will develop a green-colored film. Even though they are less appetizing, the chemical reaction does not change the flavor of the eggs. There's another way for eggs to turn green. Cooking or storing eggs in an iron skillet or a metal pan will turn them green as the iron ions from the pan react with the sulfides in the eggs. Kevin Murray, president of Tasteful Events Catering in Rochester, N.Y., offers a few tips to prevent green eggs. “I am usually cooking in volume, but it definitely depends on t...