1, preserved eggs, that is, preserved eggs, will use many accessories in the production process, including some white lime. There is even some lead oxide, that is, yellow lead powder. Some of the above lead may lead to excessive intake of heavy metals such as lead when eating preserved eggs, which may have some adverse effects on pregnant women themselves and their fetuses. In addition, preserved eggs, that is, preserved eggs, are easily contaminated by bacteria, especially salmonella.