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Why is a dark ring sometimes seen around the yolk of a boiled egg?
Wiki User
∙ 13y ago
Most people over cook their hard boiled eggs. Hydrogen sulphide generated by the decomposition of sulphur-containing amino acids in the white will react with iron in the yolk causing a (harmless) grey-green film of ferrous sulphide to form on the surface of the yolk.
Put 2 week old eggs (fresh eggs are hard to peel, and by the time eggs reach the store they are about a week old) in saucepan covered by a inch of water.
Bring to a rolling boil on high.
Immediatly reduce heat to medium and leave for 10 minutes.
Put eggs into ice water for a few minutes.
Peel.
Wiki User
∙ 14y ago
Wiki User
∙ 13y agoThe ring can appear for 2 reasons... It has been cooked longer then needed or it has been refrigerated after cooking.
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What causes the black ring around a boiled egg and how long should you boil and egg for hard boiled?
The black ring i caused by letting the cooked egg sit in the hot water - to make sure it doesn't have a dark ring dunk egg in cold water as soon as it is cooked.
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