雷公云∶凡使，性本大燥，毒，用酒浸一宿后，漉出，却用东流水浸三日夜，却，蒸，
从巳至申，出，日干用。
雷公云∶凡使，于砂盆中用醋磨，令尽，然后于火畔吸令干，重筛过用。
雷公云∶凡使，先用生甘草水浸一伏时后，漉出。去头、须，了，焙干，任入药中用。
雷公云∶凡采得后，阴干，于石臼中捣。
勿令犯铁，用之切忌尔。
雷公云∶凡使，采得后，去柄及皱皮了，用酒浸蒸，从巳至酉，出，细杵，任用也。
雷公云∶凡使，十年以上向东畔嫩根。
凡修事，采得后，铜刀剥上青黄薄皮一重，只取第二重白嫩青涎者，于槐砧上用铜刀锉
了，焙令干。
勿使皮上涎落，涎是药力。
此药恶铁并铅也。
雷公云∶凡使，先去叶、核并杂物，了，用大盆一口，使盐水洗一百转，自然无涎，日
干，任入丸散中用。
凡修事十两，用盐二两，研作末，投东流水四斗中，分作一百度洗，别有大效。
若用醋煮，即先沸醋三十余沸，后入茱萸，待醋尽，晒干。
每用十两，使醋一镒为度。
雷公云∶凡使，取好存坐稳、心坚、文如流水、碎破内容如锦文者妙；半白半黑并心虚
者，不入药用。凡使，须别槟与榔。头圆、身形矮毗者是榔；身形尖、紫文粗者是槟。槟力
小，榔力大。
凡欲使，先以刀刮去底，细切。
勿经火，恐无力效。若熟使，不如不用。
Lei Gong said: When using (Psoralea corylifolia), which is inherently very drying and toxic, soak it in wine for one night, then drain. Subsequently, soak it in running water from the east for three days and nights, then steam it from Si hour to Shen hour. Take it out, dry it in the sun, and use it.
Lei Gong said: When using, grind it in a clay mortar with vinegar until completely ground, then dry it near fire, sift it again, and use it.
Lei Gong said: When using, first soak it in raw Licorice Root (Gancao) water for one shichen (two hours), then drain. Remove the head and roots, bake it dry, and it is ready for medicinal use.
Lei Gong said: After harvesting, dry it in the shade, and pound it in a stone mortar. Do not let it touch iron; this must be strictly avoided during use.
Lei Gong said: When using, after harvesting, remove the stem and wrinkled skin, soak and steam it in wine from Si hour to You hour. Take it out, finely pound it, and use as needed.
Lei Gong said: When using, select tender roots that are ten years old or older and grow towards the east. For processing, after harvesting, peel off the outer layer of greenish-yellow thin skin with a copper knife, retaining only the second layer which is white, tender, and contains greenish juice. Cleave it on a locust wood anvil with a copper knife, then bake it dry. Do not allow the juice on the skin to fall off, as the juice constitutes the medicinal efficacy. This herb is incompatible with iron and lead.
Lei Gong said: When using, first remove leaves, seeds, and impurities. Use a large basin to wash it with salt water one hundred times until the juice naturally disappears. Dry it in the sun, and it can be used in pills and powders. For processing ten taels of the herb, use two taels of salt, grind it into powder, add it to four dou of running water from the east, and wash it in one hundred portions. This method yields special effects. If boiling with vinegar, boil the vinegar more than thirty times first, then add Chinese Cornus Fruit (Zhu Yu). Wait until the vinegar is exhausted, then dry in the sun. For every ten taels of herb, use one yi of vinegar as the limit.
Lei Gong said: When using, select those that are solid, stable, hard-hearted, with textures like flowing water, and whose broken interiors resemble brocade patterns. Those that are half-white and half-black, or have hollow hearts, are not suitable for medicinal use. One must distinguish between "Bing" and "Lang". The round-headed, short-bodied type is Lang; the pointed-bodied, coarse-purple-textured type is Bing. Bing has weak efficacy, while Lang has strong efficacy. To prepare for use, scrape off the bottom with a knife and slice it finely. Do not process with fire, lest it lose efficacy. If processed thoroughly (cooked), it is better not to use it.