Is it harmful to use water after boiling eggs in it?

It's generally safe to use the water after boiling eggs, but there are a few things to consider:

Pros:

* Nutritious: The water contains some dissolved nutrients from the eggs, primarily sulfur compounds.

* Flavorful: The water can be used for making broth or soups, adding a subtle egg flavor.

* Convenient: Saves time and effort by not having to boil fresh water.

Cons:

* Slight sulfur taste: Some people find the water has a slight sulfurous taste.

* Potential for bacteria: If the water isn't brought to a rolling boil, bacteria could be present.

* Not for everything: It's not suitable for drinking directly or for tasks requiring crystal clear water.

Best Practices:

* Use the water soon after boiling: The longer the water sits, the more likely it is to lose its flavor and nutrients.

* If using for broth or soup, add other ingredients: The egg flavor is subtle, so it's best to combine it with other vegetables or herbs.

* Boil the water thoroughly: Ensure the water is at a full rolling boil for at least 5 minutes to kill any potential bacteria.

Bottom line: Using the water after boiling eggs is safe and can add a subtle flavor to your cooking. However, be mindful of the potential for a slight sulfur taste and make sure to boil the water thoroughly.