Principle of production: the use of eggs in alkaline solution, can make the protein gel properties, so that it becomes elastic solid. However, skin egg production if the recipe is poorly controlled, will make the protein in alkaline solution instead of hydrolysis, protein denaturation for protein, it can not be eaten. If the eggshell is cracked or the recipe is not well controlled, the hydrogen sulfide inside the egg will spill out and it will turn into a golden yellow color. Normal eggs are dark green, fluffy and elastic.

Pi eggs, also known as loose eggs, changed eggs, etc., for the Chinese Han people invented the egg processed food, is a kind of China's unique food, with a special flavor, can promote appetite. According to the "Medical Forest Compendium" said it can "diarrhea lung heat, sober up, go to the large intestine fire, cure diarrhea. It can disperse and astringent", commonly used to treat sore throat, pharyngotherapy, hoarseness, constipation.

Pi eggs, not only a delicacy, but also has a certain medicinal value. Wang Shixiong's "with the rest of the house diet" said: "skin eggs, taste pungent, astringent, sweet, salty, can diarrhea, sobering, go to the large intestine fire, treatment of diarrhea and dysentery, can be dispersed can be convergence." Chinese medicine believes that the skin egg is cool in nature, can cure eye pain, toothache, high blood pressure, tinnitus and vertigo and other diseases. The general public can eat: the most suitable for those who have a strong fire; children, spleen yang insufficiency, cold and wet dysentery, cardiovascular disease, liver and kidney disease patients eat less.

Precautions: loose eggs should not be eaten with turtle, plums, brown sugar. Usage and dosage: consumption of pine eggs should be accompanied by ginger and vinegar detoxification; pine eggs are best eaten after steaming, pine eggs also contain lead, children are best eaten sparingly. Should not be stored in the refrigerator for a long time.