We try to set aside they eggs that we think hold the green yolk because we sell eggs every once and a while and i don't want anyone to get a green yolk! A DAD was left horrified after he bit into a McDonald’s egg McMuffin to find the yolk had turned GREEN before realising he had already fed some to his baby girl. MALAPPURAM: The curious case of six hens in the small poultry farm of A K Shihabudheen, a native of Othukkungal in Malappuram, laying eggs with green yolks, is now the talk of the town. This is ultimately what causes the discoloration around the yolk once it is boiled. https://www.coasttocoastam.com/article/mystery-of-green-egg-yolks Green yolks can be caused by birds consuming green herbage to excess. The discoloration results from a harmless chemical reaction in which hydrogen sulfide produced by sulfur and hydrogen in the egg whites reacts with iron in the yolks. Scrambled eggs cooked at too high a temperature or held on a steam table for too long, can also develop a greenish cast. Interestingly, the new hens also laid green-yolked eggs. Ordinarily, when egg yolks turn green, it signifies that you’ve overcooked the eggs. The ring around the yolk of a hard-boiled egg is sometimes caused by a chemical reaction from sulfur and iron, which is a natural reaction. I can't bring myself to taste it and see if it tastes normal though. Hard-Boiled Green Egg Yolks . "Abnormal Yolk Colour The colour of the yolk is determined by the diet of the bird, although some disease conditions can also contribute. Stephen Wright, 29, had stopp… Such a blue-gray, greenish tint appears due to a chemical reaction during cooking: the yellow color turns dark green due to the formation of iron sulfide at the junction of the white and yolk. Also the green egg yolk doesn't smell but seems a little tougher than a regular egg yolk. Instead, Shihabudheen decided to hatch some of the eggs laid by the hen. The family did not consume the eggs when the first hen laid the egg with green yolk as they wondered if they would be safe or not. The sulfur, from the egg white, and iron, from the yolk, form ferrous sulfide on the surface of the yolk. 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. Similar to the way a green ring forms around hard-boiled yolks due to a reaction between the iron and hydrogen sulfide in the egg, scrambled eggs can also experience a color change. https://www.huffpost.com/entry/green-rim-hard-boiled-egg_n_6464402 The green color can also be caused by a high amount of iron in the cooking water. Why Do Hard-Boiled Egg Yolks Turn Green? You can get grayish-green egg yolks by hard boiling eggs. 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