1. Traditionally produced preserved eggs contain trace amounts of lead and other heavy metal materials, so it is not suitable to eat too much.

2. During the pickling process of traditional preserved eggs, heavy metals such as lead or copper are often added to the dipping solution to solidify the protein. Heavy metals can remain during cleaning and cooking.

3. The new technology currently used makes the production of preserved eggs safer. Some new types of preserved eggs do not contain lead and other heavy metals but are more expensive. You can choose to buy them by yourself.

Extended information:

Preserved eggs, also known as preserved eggs, changed eggs, gray-wrapped eggs, wrapped eggs, etc., are a traditional Chinese flavored egg product. The main raw material is duck eggs, which have a fresh, smooth and refreshing taste, slightly salty, and unique color, aroma and flavor. Preserved eggs are not only loved by domestic consumers, but also enjoy a high reputation in the international market.

After special processing, the preserved eggs will become dark and shiny, with white patterns on them. When you smell them, a special aroma will come out. They are one of the favorite delicacies of the people. .

Preserved eggs are not only a delicacy, but also have certain medicinal value. Wang Shixiong said in "Suixiju Diet Manual": "Preserved eggs are pungent, astringent, sweet, and salty. They can purge heat, sober up, remove large intestine fire, treat diarrhea, and can be dispersed and agglomerated." Traditional Chinese medicine believes that preserved eggs are cool in nature and can be used to treat diarrhea. Treat eye pain, toothache, high blood pressure, tinnitus, dizziness and other diseases.

Reference materials:

Baidu Encyclopedia_Preserved Eggs