Gray yolk on hard boilded eggs?

Question

I just made a batch of hardboilded eggs... when I opened them up some had gray coating on usually yellow yolk.... but not all of them. Does this mean some of the eggs were older/cooked too long/???? It tastes fine but is visually yucky to the eater. Why does this happen?

Answer 1

This tends to happen if the eggs are cooked too long.

Here's how I do them:

Place eggs in saucepan and cover with 1" of water. Add a pinch of salt. Bring to a full boil. Cover, remove from heat, and let stand for 10 minutes. Drain eggs and place them in a bowl of ice water until cool.

Answer 2

Overcooking is probably the problem. Cooling them faster also helps prevent some of this. I drain and use an icewater bath as soon as they are done cooking. For boiling eggs, I place the eggs on their side the night before. This helps center the yolk for good looks in deviled eggs. I place in a pot of water with salt and bring to a boil. Let boil for 2 minutes and then remove from heat. Cover with a tight fitting lid and let set for 18 to 20 minutes. Drain and cool quickly.

Answer 3

That happened because of two things...
You either had the water boiling to hard or
You cooked them too long.
Next time bring them to a boil, then turn down the heat to just barely a simme,r or not even, and cook them for 15 minutes.

They are fine to eat the way you did it though.

Answer 4

Cooked to long.

Answer 5

I don't know why it happens (sulfur I think) but several cooking shows lately showed how to cook eggs so that doesn't happen. http://www.elise.com/recipes/archives/005251how_to_make_perfect_hard_boiled_eggs.php

http://www.elise.com/recipes/archives/001837deviled_eggs.php

Answer 6

you cooked them too long