Eggs are a staple in many households. They are affordable, versatile, and packed with protein. However, like any perishable food, eggs can spoil. Eating a bad egg can cause food poisoning, so it’s important to know how to recognize the signs of spoilage—especially after boiling them. While boiling can kill certain bacteria, it does not make a spoiled egg safe to eat. Here’s a complete guide to help you identify whether a boiled egg has gone bad.

1. Check the Egg Before Boiling

The first step in preventing problems is to examine the egg before you cook it. One of the most reliable methods is the water test. Fill a bowl with cold water and gently place the egg inside.

• If the egg sinks and lies flat on the bottom, it is fresh.
• If it sinks but stands upright, it is older but still safe to eat soon.
• If it floats to the surface, it has likely gone bad and should be discarded.

Eggs float because, over time, moisture and carbon dioxide escape through the shell, allowing air to enter. The larger the air pocket inside, the more buoyant the egg becomes.

You should also inspect the shell. If it is cracked, slimy, or has an unusual odor before cooking, do not use it.

2. Notice Any Unusual Smell During Boiling

When boiling eggs, pay attention to the smell of the water. Fresh eggs have a mild scent, even when cooked. However, if you notice a strong, unpleasant, or sulfur-like odor while boiling, that may be a warning sign.

Sometimes eggs release a slight sulfur smell when overcooked, which is normal. But if the smell is sharp, rotten, or overwhelmingly foul, it’s best to throw the eggs away immediately.

If a shell cracks open during boiling and releases a bad smell, that egg is likely spoiled.

3. Examine the Egg After Peeling

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