May I ask why leather eggs contain high levels of lead? Where does the lead in them come from?

Traditionally, heavy metals such as lead or copper are added to the dipping solution during the pickling process to solidify the protein. In accordance with the provisions of the Taiwan Department of Health, the lead content of eggs shall not exceed 2ppm, copper content shall not exceed 8ppm, and agricultural units also counseled the industry to produce good eggs, so that the lead content shall not exceed 0.3ppm, copper content shall not exceed 5ppm, so qualified manufacturers of the impregnating solution more than not add heavy metals, or the content of very little, but now there are no lead-free puffed eggs, in fact, lead-free puffed eggs, the same! In fact, the lead-free eggs also contain lead, adults can also, but for children or eat less for good. They are safe to eat and nutritious! If you eat eggs regularly, they can cause lead poisoning. This can lead to insomnia, inability to concentrate, anemia, joint pain, slow thinking, and impaired brain function. In addition, lead replaces calcium, affecting calcium intake and may cause calcium deficiency. Suggestions: When eating puffed eggs, add some vinegar, vinegar can sterilize, and can neutralize some of the alkaline of puffed eggs, and eat more flavorful.