# How to tell if an egg is hard-boiled?

In this brief article, we will answer the question, “How to tell if an egg is hard-boiled?” tips to check whether the egg is hard-boiled and marking hard-boiled eggs.

## How to tell if an egg is hard-boiled?

Place the egg on a table and spin them to detect whether the egg is hard-boiled. After the egg starts spinning, stop the rotation of the egg using your index finger. If the egg immediately stops spinning, it is hard-boiled. If it still moves around slowly, the egg is uncooked.

The egg moves around slowly as the liquid yolk and egg white is still moving inside the shell.

You do not necessarily require a table for the spin test. You can use any smooth surface like a countertop or even a cutting board.

It is not necessary to stop the eggs with your finger. If you want to test whether a  bunch of eggs are hard-boiled, it would make sense to spin them. If the egg spins steadily and smoothly, it is likely to be hard-boiled.

If the egg wobbles in between, it is likely to be uncooked. This is because the liquid contents inside the egg can cause it to lose balance and not move steadily.

## What are some other tips to check whether the egg is hard-boiled?

• Shake the egg gently by holding it in your hand. If the egg is uncooked, you can feel the liquid contents inside the egg. If the egg is hard-boiled, you can the egg would be firm and there would be no movement inside the shell.
• Another technique is to check whether there are air bubbles present in the egg. For this purpose, place the egg inside a bowl of boiling water.

Observe bubbles coming from the egg and immediately remove the eggs from boiling water after you observe it or else the eggs would get cooked.

If the eggs are uncooked, they are likely to display bubbles. This is because eggshells contain pores that can allow the gases to enter through them.

When the egg is heated, the gases present inside the shell would expand and pass through the holes. This can cause the formation of bubbles.

If the eggs are hard-boiled, you would notice an absence of these bubbles. This is because the gases present inside the eggs were already gone through the pores during the course of the boiling process.

• This method would be slightly restrictive as you would have to attempt during the night. During the nighttime, switch off the lights inside your room. Take a flashlight with you as well. The flashlight should emit bright light.

Hold the egg against the flashlight. If the egg appears to light up, it indicates that the egg is uncooked. This is because the liquid contents present inside the eggshells would aid in the passage of light.

If the egg does not light up, it is likely to be har-boiled. This is because the egg whites and yolk have turned firm and solid after boiling/ cooking which does not allow the light to pass through them.

• You can also mark your hard-boiled eggs. This would save your time as you would not need to do these tests mentioned.

Make sure the eggs are dry. Then take a marker and on the eggshells, you can mark the eggs. For instance, writing the letter “H” would indicate hard-boiled.

As you are about to remove the eggshells before consuming them, you would not consume the ink of the marker. So you can rest easy.

• Another technique would be to boil the onion skins and keep the eggs alongside them. The hard-boiled eggs would develop a beige color which would help you in identifying them apart from the raw eggs.

The beige color would be more prominent if you use a high number of onion skins to be boiled. Use red onion skins to obtain a more prominent color on your eggs.

• Another technique would be to use food colorings on the hard-boiled eggshells. Marking them in this manner can help you tell them apart from uncooked eggs.

You can use the food colorings while the eggs are being boiled in the pot. Add a drop or two of food colorings along with a teaspoon of vinegar.

If you have already boiled the eggs, you can soak them in a mixture containing food colorings, boiling water, and 1 tsp vinegar. The food colorings would not affect the taste of the eggs.

## Conclusion

In this brief article, we have answered the question, “How to tell if an egg is hard-boiled?” tips to check whether the egg is hard-boiled and marking hard-boiled eggs.