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Pungent and sweet in flavor, cold in nature, non-toxic. Treats heart-heat with irritability, as well as stagnation in the five zang organs and mass formations (zheng jie). Brightens the eyes, clears deficiency-heat above the diaphragm, and reduces swelling and toxicity. This is refined from Puxiao (Mirabilite). (Newly added content appears in *Yaoxing Lun* and the works of Ri Huazi.)

The Immortal Canon states: Xuanmingfen is prepared by processing Puxiao. Puxiao is the essence of Taiyin (the spleen/lung qi mechanism), the son of water. It is a medicine that contains yang within yin. Taiyin is called "Xuan" (Mysterious), which internally searches out various diseases; its efficacy is unparalleled. It treats all kinds of wind-heat-toxins, searches out cold accumulations, pi-mass (fixed masses) with distension and fullness, wulao qishang (five exhaustions and seven injuries), bone-steaming tuberculosis (chuan shi), headache with fever, searches out evil diseases, constipation of the five zang organs, obstruction of the large and small intestines, heat-strangury of the sanjiao, zhu-wu disease (infectious or miasmic diseases), cough with vomiting and reflux, dry mouth and throat, throat obstruction, accumulation of heat in the heart, liver, spleen, lungs, and stomach, palpitations, forgetfulness, disharmony of ying and wei, alcohol intoxication or overconsumption of meat, dietary excess, cold pain in the lower back and knees, soreness and weakness of hands and feet, chronic cold or heat, obstruction of the four limbs, stiffness of the back and shoulders, blurred vision and dizziness, weakness after prolonged eye use, intestinal wind with hemorrhoids, blood stasis with irregular menstruation. For postpartum women, children with gan-qi (malnutrition syndrome), yin-poison shaoyin disease, epidemic diseases affecting both interior and exterior, it treats all these conditions. Long-term use of this medicine makes the body light and the ears clear, preserves youth, and prolongs life. In emergencies to detoxify and for tonification, it is miraculous. Emperor Ming of Tang heard that Daoist Liu Xuenzhen in Zhongnan Mountain consumed this medicine, so he issued an edict to ask: "I hear you live to about three hundred years old. What medicine do you consume to remain in the world so vigorous and joyful?" Xuenzhen replied: "According to the Immortal Canon, I refine Puxiao into Xuanmingfen. By consuming only this medicine, I have no illness and achieve longevity. This medicine has no dregs, is warm in nature, and eliminates various diseases. Even raw consumption can save lives in emergencies, let alone refined long-term use. It benefits essence and strengthens qi, assists yang and verifies yin. It applies to men and women, young and old, regardless of seasonal cold or heat, treating conditions after meals whether cold or hot. Divide one liang into twelve doses, adjusting according to circumstances. If one feels obstructed heat, shaoyin disease, headache with nasal congestion, inability to move limbs, difficulty eating, restlessness and abdominal distension, regardless of day or night urgency, requiring purgation for relief, adjust the dose based on age from one fen to half a liang. Administer with Taohua Tang (Peach Blossom Decoction) as the best vehicle; secondly with Congtang (Scallion Decoction); if not yet unobstructed, administer another bowl or two of decoction immediately for effect. Natural regulation and tonification resume as usual. To ensure slight bowel movement without constipation, long-term use gradually takes effect. Morning and evening administration will not deplete the five zang organs, leaving one peaceful and content. When first taking this medicine, take three qianbi on an empty stomach daily with wine, drink, or tea, and another three qianbi long after meals. Within seven days, mild diarrhea with yellow-black watery saliva may occur; this is the expulsion of the root causes of various diseases, do not fear it. After seven days, the abdomen and viscera gradually feel warm, digestion improves, and qi descends. Avoid bitter sophora root (Kushen) or any fish, lotus root, and vegetables. The antidote for dietary poisons is to decoct scallion whites in one teacup of water, mix with two qian of Xuanmingfen, and take at once; various poisons are immediately purged. For pregnant women, long-term use calms the fetus; upon delivery, there are no sores or diseases. Long-term use removes the old and nourishes the new, stabilizing qi and blood daily. In case of accidental poisoning, take one fen of Dichan (Euphorbia kansui), half a liang of Qini (Nephrolepis rhizome) and Xijiao (Rhinoceros Horn), and the poison is instantly resolved. For long-term maintenance, administer with Damatang (Hemp Seed Decoction) as the vehicle. This medicine specifically warms the water organ; for women, it nourishes blood vessels and treats bone-steaming wulao, palpitations, forgetfulness, and wind-heat-toxin, with immediate recovery. It enhances complexion, opens orifices, strengthens the spleen, lightens the body, prolongs life, conserves spirit, and brightens the eyes. Other effects cannot be fully listed; some are recorded in the Taiyin Jing. Take two jin of Puxiao, ensuring it is white and clean. Place it in a solidly stacked porcelain furnace, cover the furnace mouth with a tile, and burn with ten jin of charcoal. Do not cover the furnace mouth initially; place one piece of charcoal inside. Wait until boiling stabilizes, then cover it, and add fifteen jin of charcoal to cover completely. Allow to cool for one fu period (approx. 2 hours). Remove the medicine from the furnace, spread it on paper on the ground, cover with a basin for one fu period, and sun-dry to obtain dry powder. Add two liang of Gancao (Licorice Root), used raw or processed, finely pounded and sieved into powder."