The eggs have a shelf life and are not suitable for consumption if they have been left for a long time.

The "National Standard of the People's Republic of China" (GB9694-88) for preserved eggs stipulates that preserved eggs should be shelf-stable for three months and five months respectively under different conditions when the packaging is intact.

For preserved eggs, there are strict national standards in terms of production process and technical requirements. Since preserved eggs contain trace amounts of lead, products that do not meet national standards are very likely to harm your health.

Extended information:

When purchasing preserved eggs, choose ones with complete packaging and QS logo. In addition, you must also do the following 4 points.

At first glance, choose those with gray-white skin, no dark spots, no cracks, and intact eggshells.

Second weighing, put the preserved eggs in the palm of your hand and weigh them gently. The ones that tremble more are of better quality.

Three shakes, put the preserved eggs to your ears and shake them. Good preserved eggs have no sound.

Four photos, using light to see through, most of the eggs are black or dark brown, and a small part is yellow or light red, which is a high-quality egg.

When choosing preserved eggs outside, remember to check the shelf life and production date.

People's Daily Online - The shelf life of preserved eggs is incorrectly marked? Consumers will be compensated

Baidu Encyclopedia - Preserved eggs