Salted duck eggs preserved at home can be stored for about 9 months at room temperature and 12 months in cold storage, while the shelf life of vacuum-packed salted duck eggs purchased in supermarkets is generally about 3 months, subject to the product manual.
The shell of high-quality salted duck eggs should be clean, smooth, round, crack-free and blue. The shell of poor quality salted duck eggs is gray with white or black spots, which is fragile and has a relatively short shelf life. Shake the salted duck eggs gently, and the high-quality eggs should vibrate slightly. If they feel abnormal, accompanied by abnormal noise, it means that the duck eggs have gone bad.