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Dihuang should be excavated every October - November. Remove stems and leaves, fibrous roots, take roots and remove fresh soil. When digging for fresh yellow, care should be taken to prevent it from breaking. After being unearthed, it should be processed as soon as possible due to its mildew. If there is no condition for processing at a time, the soil attached to the fresh yellow earth should not be washed and placed directly on the land, then covered with dry soil for storage. The storage time should not exceed 3 months. When processing, remove stems, leaves, fibrous roots, and sediment (not washable with water). In order to avoid cracking, first bake for 2 days, until most of the yellow sweat and then gradually increase the firepower. When baking, please pay attention to frequent turnovers, and you can't stop the fire halfway. After another three days, the rehmannia will have a soft body and a hardened outer skin. At this time, the cease-fire will be taken out of the place of origin. It is better to use large blocks and black oil.
When processing rehmannia, take 5 kg of Dasheng Land, 125 grams of dried tangerine peel, and 50 grams of Amomum vulgare at the end of research. Soak the raw land with water for 1 hour to 2 hours, wash and scoop up, place it in the altar, add tangerine peel and Amomum vulgare Mix well and pour in clean water. The surface of the water is 6 cm above the surface of the medicine. The altar mouth is covered and the yellow mud seals. The bottom of the altar is made of bricks and triangles. Take the husks around the bottom of the altar and the altar. Light the enamel and pour for 24 hours. When the alpine juice is exhausted, remove it and dry it until it reaches 70% to 80% dry. Pick up the orange peel. The thick slices are cut with a bamboo knife and dried to mature.
In addition, the raw land will be immersed in rice wine, wine liquid did not pass the drug surface, after drying the liquid with a small fire, remove and dry, or place in the steamer steamed place, and then dried, but also can be made rehmannia.
Ground yellow processing method
Rehmannia is a perennial herb of the family Scrophulariaceae with a rhizome of yellow, lavender flowers, and oblong leaves with wrinkles. Medicinal herbs and rehmannia. There is the effect of heat and fluid in the habitat, and there are nourishing yin and blood in the rehmannia.