1. Brush the saponins clean with a toothbrush and soak them in boiling water. If the saponins are too dry, it will not easily swell. It will take 2 to 3 days to fully soak;

2. Mash the swollen saponin. The more it swells, the easier it is to mash. It is best to pound it with a stone;

3. Add 10 times of water to the mashed saponin and heat it. , the soap locust water is easy to bubble after boiling. The water should be simmered on low heat before boiling, add some brown sugar (to help the fermentation of beneficial microorganisms after the soap locust liquid is stored), stir, and simmer for another 10 minutes. When the soap locust liquid is thicker, turn off the heat. ;

4. Cool, filter and bottle (preferably in glass or porcelain bottles). When the temperature is not low, try to store it in the refrigerator. The saponin liquid brewed for the first time is thicker and suitable for washing hair. Extended information

Saponaria is one of the unique tree species of the genus Saponaria in the family Hemataceae in my country. It should be in the shape of a scabbard, slightly curved, 100 to 400 mm long, about 40 mm wide, and 10 to 15 mm thick. The surface is reddish brown, covered with gray frost, and the seeds are raised. The two ends are slightly pointed, the base gradually narrows and curves, there are short fruit stalks or fruit stalk marks, and there are obvious longitudinal ridges on both sides. Most species, flat oval, yellow-brown, smooth. Hard quality. It has a slight odor, is irritating, and has a spicy taste. The complete thorns are often branched, and sometimes divided into small branches. The thorn ends are sharp and the base is flat and cylindrical. The total length is about 10cm or longer, and the diameter of the base is 0.8-1.2cm. The surface is purple-brown or reddish-brown. Light body, hard texture, yellowish white wood on cut surface, loose pith, brown, odorless and light taste. Habits: It likes light but tolerates a little shade. It likes a warm and humid climate and fertile soil. It is also tolerant of cold and drought. It has no strict requirements on the soil.

Saponia japonica, also known as saponaria locust tree, grows vigorously and is dioecious. Female trees have strong ability to produce pods (saponaria locust). Honey locust fruit is a natural raw material for medicine, food, health care products, cosmetics and detergents; honey locust seeds can digest food and appetizer, and contain a kind of vegetable gum (guar gum) which is an important strategic raw material; honey locust thorn (soap needle) Containing flavonoid glycosides, phenols, and amino acids, it has high economic value.

Reference material: Baidu Encyclopedia of Chinese Sapodilla