If your eggs have a green ring around the yolk, it means that…See more

A green ring on a hard-cooked yolk is a result of overcooking and is caused by sulfur and iron compounds in the egg reacting on the yolk’s surface. The green color can also be caused by a high amount of iron in the cooking water. Scrambled eggs cooked at too high a temperature or held on a steam table for too long, can also develop a greenish cast. The green color is safe to consume.