Highlight three ways of preventing the formation of the carbon ring in boiled eggs.

1. Use fresh eggs: Fresh eggs have a lower pH level, which helps prevent the formation of the carbon ring. Make sure to use eggs that are within their expiration date and have been properly stored.

2. Avoid overcooking: Overcooking eggs can lead to the formation of the carbon ring. To prevent this, cook the eggs for the recommended amount of time and avoid boiling them for too long.

3. Use a gentle cooking method: Instead of boiling the eggs vigorously, try simmering them gently. This can help prevent the formation of the carbon ring by reducing the likelihood of the eggs bouncing around and hitting the sides of the pot.

1. Prick the shell before boiling: This allows the trapped air inside the egg to escape, preventing the formation of a carbon ring.

2. Add vinegar to the boiling water: The acidity of the vinegar helps to dissolve the calcium carbonate in the eggshell, creating small holes that allow air to escape.

3. Boil the eggs gently: Boiling too vigorously can cause the eggshells to crack and allow sulfur compounds to escape, leading to the formation of a carbon ring.