Home Preservation of Eggs — True Statements

Correct Answer: All of the above (referring to all three correct sub-statements)

All three sub-statements in the original question are true:

1. Water glass (sodium silicate) method: 1 part sodium silicate dissolved in 10 parts water. The silica deposits and seals the pores of the egg shell, preventing gaseous exchange and microbial entry.
2. Lime water (Ca(OH)₂) method: Ca(OH)₂ reacts with CO₂ from the egg to form a thin film of CaCO₃ on the shell surface, sealing the pores.
3. Both methods can preserve eggs at room temperature for approximately 1 month.

Home vs. Commercial Preservation Methods

Thermo-Stabilization

• Oil bath at 55°C / 15 min or 58°C / 10 min.
• Causes coagulation of a thin albumin layer below the shell membrane, blocking air and moisture passage.
• This is a commercial method for stabilizing albumin quality.