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Why do you put walnut shells to boil eggs tender?
Walnut shell contains juglone, hydrogenated juglone, β-glucoside, tannin, gallic acid and so on.

Juglandins are orange needle-shaped crystals with anti-bleeding biological activity. Together with Juglandins and several reduced derivatives, Juglandins have antibacterial biological activity, and can be used as medicine to treat hemorrhagic collapse, breast abscess, scabies, psoriasis, sore poison and so on. Has the effects of relieving swelling and itching. Walnut shells can also be used as raw materials for producing activated carbon.

Eggs are rich in nutrition. It contains protein, fat, vitamins, inorganic salts and enzymes. These nutrients have a great influence on human growth, health and longevity.

Egg protein contains an enzyme, which has the function of bacteriolysis. There are many tiny pores on the eggshell. Although bacteria can enter eggs through pores, eggs are still not easy to destroy and deteriorate due to the action of enzymolysis bacteria. Cooked eggs are easy to rot, which is caused by the failure of enzymes in eggs. In addition, this enzyme can also inhibit viral infection. Some people drink vinegar or wine eggs when they have a cold, which is the mechanism.