Green walnuts have a layer of skin on the outside, which is poisonous and smells terrible. The juice from walnut peels can stain our hands black and is difficult to wash off immediately. Therefore, when eating green walnuts, you cannot smash them with anything. You can eat them after peeling them off. When eating green walnuts, the walnut shell and the inner shell have not yet grown hard. Green walnut skin is also known as: Qinglongpi. This product is the outer peel of Juglansregia L., a plant in the Juglans family. When the fruit is immature in summer and autumn, the fleshy green outer peel is collected. Bitter, astringent, flat. poisonous. Reduce swelling and relieve itching. Used for chronic tracheitis; external use to treat tinea capitis, psoriasis, carbuncle and sores. Walnut green peel mainly contains chemical components such as volatile oil, fatty acids, walnut polysaccharide, juglone and its derivatives. Walnut green peel is a toxic substance, and discarding it at will will cause great harm to the environment.