Smell:
This is the most reliable test. A spoiled egg will have a strong, rotten odor. Even if you are unsure visually, your nose will usually detect a problem right away. If it smells bad, do not taste it—discard it immediately.

Appearance of the Egg White:
The egg white should be firm, slightly glossy, and evenly colored. If it looks grayish, excessively watery, or has an unusual slimy texture, it may not be safe to eat.

Appearance of the Yolk:
A properly boiled egg yolk should be yellow and firm. If you notice dark discoloration, unusual spots, or a strange texture, do not consume it.

It is important to understand that a greenish-gray ring around the yolk does not necessarily mean the egg is bad. This ring forms when eggs are overcooked, causing a reaction between sulfur and iron. While it may not look appealing, it is safe to eat.

4. Consider Storage Time

Even boiled eggs have a limited shelf life. Hard-boiled eggs should be refrigerated and eaten within one week. If left at room temperature for more than two hours, they should be thrown away.

If you cannot remember when you boiled the eggs, it is better to be cautious and avoid eating them.

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