The raw materials for making preserved eggs are eggs, lime, soda, sawdust or plant ash. How can it contain lead?

Preserved eggs are made of lime (calcium hydroxide) and washed alkali (sodium carbonate) mixed in mud. In order to speed up the production cycle, a certain amount of lead oxide (Lithuanian) is often added. Therefore, preserved eggs not only contain a lot of lead, but also are alkaline (alkalinity is sodium hydroxide generated by lime and alkali washing). Eating preserved eggs not only consumes a lot of stomach acid, but also consumes more lead, which is not good for your health. Even if you want to eat, it is best to eat lead-free preserved eggs, but it will still consume a lot of stomach acid, so it is better not to eat them.