If you have ever boiled eggs, you have probably noticed that sometimes a grey rim appears on the yolk..
Someone might think that it is undesirable to eat such a product, but there is no reason to worry, says Yulia Arkhipova, an expert at the BelNovosti online publication.
Why does the yolk change colour?
The change in colour of the yellow core of the egg is the result of heat treatment and is not a sign of a spoiled product.
The grey rim appears due to a chemical reaction: during cooking, protein molecules stick together and sulfur is released. The latter turns into hydrogen sulfide, which, in turn, comes into contact with the iron in the yolk. As a result, iron sulfide is formed – that very grey color.
To sum up: if you took boiled eggs out of the saucepan and after removing the shell, you found a grey yolk, you can safely eat them.
You cannot eat eggs that have been boiled for more than 20 minutes – prolonged boiling leads to an increase in the release of hydrogen sulfide, as a result of which the yolk acquires a blue-green color.
High content of the substance can cause poisoning and exacerbation of gastrointestinal diseases.
If you have ever boiled eggs, you have probably noticed that sometimes a grey rim appears on the yolk..
Someone might think that it is undesirable to eat such a product, but there is no reason to worry, says Yulia Arkhipova, an expert at the BelNovosti online publication.
Why does the yolk change colour?
The change in colour of the yellow core of the egg is the result of heat treatment and is not a sign of a spoiled product.
The grey rim appears due to a chemical reaction: during cooking, protein molecules stick together and sulfur is released. The latter turns into hydrogen sulfide, which, in turn, comes into contact with the iron in the yolk. As a result, iron sulfide is formed – that very grey color.
To sum up: if you took boiled eggs out of the saucepan and after removing the shell, you found a grey yolk, you can safely eat them.
You cannot eat eggs that have been boiled for more than 20 minutes – prolonged boiling leads to an increase in the release of hydrogen sulfide, as a result of which the yolk acquires a blue-green color.
High content of the substance can cause poisoning and exacerbation of gastrointestinal diseases.
If you have ever boiled eggs, you have probably noticed that sometimes a grey rim appears on the yolk..
Someone might think that it is undesirable to eat such a product, but there is no reason to worry, says Yulia Arkhipova, an expert at the BelNovosti online publication.
Why does the yolk change colour?
The change in colour of the yellow core of the egg is the result of heat treatment and is not a sign of a spoiled product.
The grey rim appears due to a chemical reaction: during cooking, protein molecules stick together and sulfur is released. The latter turns into hydrogen sulfide, which, in turn, comes into contact with the iron in the yolk. As a result, iron sulfide is formed – that very grey color.
To sum up: if you took boiled eggs out of the saucepan and after removing the shell, you found a grey yolk, you can safely eat them.
You cannot eat eggs that have been boiled for more than 20 minutes – prolonged boiling leads to an increase in the release of hydrogen sulfide, as a result of which the yolk acquires a blue-green color.
High content of the substance can cause poisoning and exacerbation of gastrointestinal diseases.
If you have ever boiled eggs, you have probably noticed that sometimes a grey rim appears on the yolk..
Someone might think that it is undesirable to eat such a product, but there is no reason to worry, says Yulia Arkhipova, an expert at the BelNovosti online publication.
Why does the yolk change colour?
The change in colour of the yellow core of the egg is the result of heat treatment and is not a sign of a spoiled product.
The grey rim appears due to a chemical reaction: during cooking, protein molecules stick together and sulfur is released. The latter turns into hydrogen sulfide, which, in turn, comes into contact with the iron in the yolk. As a result, iron sulfide is formed – that very grey color.
To sum up: if you took boiled eggs out of the saucepan and after removing the shell, you found a grey yolk, you can safely eat them.
If you have ever boiled eggs, you have probably noticed that sometimes a grey rim appears on the yolk..
Someone might think that it is undesirable to eat such a product, but there is no reason to worry, says Yulia Arkhipova, an expert at the BelNovosti online publication.
Why does the yolk change colour?
The change in colour of the yellow core of the egg is the result of heat treatment and is not a sign of a spoiled product.
The grey rim appears due to a chemical reaction: during cooking, protein molecules stick together and sulfur is released. The latter is converted into hydrogen sulfide, which, in turn, comes into contact with the iron from the yolk
If you have ever boiled eggs, you have probably noticed that sometimes a grey rim appears on the yolk..
Someone might think that it is undesirable to eat such a product, but there is no reason to worry, says Yulia Arkhipova, an expert at the BelNovosti online publication.
Why does the yolk change colour?
The change in colour of the yellow core of the egg is the result of heat treatment and is not a sign of a spoiled product.
The grey rim appears due to a chemical reaction: during cooking, protein molecules stick together and sulfur is released. The latter turns into hydrogen sulfide, which, in turn, comes into contact with the iron in the yolk. As a result, iron sulfide is formed – that very grey color.
To summarize: if you took boiled eggs out of the saucepan and after removing the shell, you found a grey yolk, you can safely eat them.
You cannot eat eggs that have been boiled for more than 20 minutes – prolonged boiling leads to an increase in the release of hydrogen sulfide, as a result of which the yolk acquires a blue-green color.
High content of the substance can cause poisoning and exacerbation of gastrointestinal diseases.
