一名焰硝，一名火硝。
火为之使。畏女菀、杏仁、竹叶、粥。恶曾青、苦参、苦菜。柔五金。化七十二石为水。
辛、苦、微咸。有毒。阴中之阳也。而气大温，其性上升。散三焦火郁，调五脏虚寒。
得竹沥，点重舌、鹅口。配
雄黄，研细末，点少许入 内，治诸心腹痛。凡用，溶化投甘草入内，即伏火。
朴硝下降，属水，气寒。硝石为造炮焰硝，上升，属火，气大温。
怪症∶尸厥四肢冰冷，不省人事，腹如雷鸣，宜灸气海七壮，内服火硝五钱、硫黄二两，
为
末，姜、附汤下。
一名透骨将军
畏一切酸、浆水、醋、乌梅、牡蛎、卷柏、萝卜、独帚、羊蹄、商陆
、冬瓜、苍耳、蚕沙、海螵蛸、羊 骨、羊踯躅、鱼醒草、河豚鱼胶。忌羊血。消五金八石
。
咸、苦、辛，热。有毒。治症瘕肉积，破结血顽痰，又能尽化三焦之痼疾。其性能消金
石、腐肠胃，不宜服。服之
化心为血。
白净者良。水飞醋煮干如霜，刮下用。
中其毒者，以生绿豆研汁，饮二三升解之。
一名鹏砂，一名盆砂。
畏知母、芸苔、紫苏、甑带、何首乌、鹅不食草。制汞。哑铜。
甘、微咸，凉。治上焦痰热，瘕结，喉痹，骨哽，恶疮弩肉，翳障，口齿诸病。得生姜
片，蘸揩木舌肿强。得冰片
少许，研细末，灯草蘸点弩肉翳障。配牙硝，治咽喉谷贼肿痛。配白梅，治咽喉肿痛。
出西南部。西部者白如明矾，南部者黄如桃胶。
Nux Boracis, also known as Yanxiao (Flame Nitre), also known as Huoxiao (Fire Nitre).
It is the envoy of Fire. It is incompatible with Nüwan (Radix Dipsaci), Xingren (Semen Armeniacae Amarum), Zhuye (Bamboo Leaf), and congee. It is adverse to Zengqing (Azurite), Kushen (Radix Sophorae Flavescentis), and Kucai (Herba Taraxaci). It can soften the Five Metals (Gold, Silver, Copper, Iron, Tin) and dissolve seventy-two kinds of stones into water.
Pungent, bitter, slightly salty. Toxic. It belongs to Yang within Yin. Its qi is greatly warm, and its nature ascends. It dissipates fire stagnation in the Sanjiao (Triple Burner) and regulates deficiency-cold in the Five Zang Organs.
Combined with Zhuli (Bamboo Juice), applied topically to treat Chongshe (Double Tongue) and Ekou (Goose Mouth/Thrush). Combined with Xionghuang (Realgar), ground into fine powder, a small amount applied to the affected area to treat various heart and abdominal pains. When used, it should be dissolved and mixed with Gancao (Licorice Root) to subdue its fire property.
Puxiao (Mirabilite) descends, belongs to Water, and has cold qi. Xiaoshi (Nux Boracis) is used to manufacture Pao Yanxiao (Processed Flame Nitre), ascends, belongs to Fire, and has greatly warm qi.
Strange Syndrome: In Shijue (Corpse-like Coma) with cold limbs, unconsciousness, and borborygmus in the abdomen, moxa should be applied to Qihai (CV6) for seven moxibustions. Internally, take Huoxiao (Fire Nitre) 5 qian and Liuhuang (Sulfur) 2 liang, ground into powder, and taken down with Jiangfu Tang (Ginger and Aconite Decoction).
Tougou Jiangjun (Bone-Penetrating General), also known as Pengsha (Borax).
Incompatible with all sour substances, Jiangshui (Fermented Rice Water), vinegar, Wumei (Fructus Mume), Muli (Concha Ostreae), Juanbai (Herba Selaginellae Tamariscinae), Luobo (Radish), Duzhou (unknown herb), Yangti (Radix Rheci), Shanglu (Radix Phytolaccae), Donggua (Winter Melon), Cang'er (Fructus Xanthii), Can Sha (Silkworm Frass), Haipiaoxiao (Endotheca Concha Sepiae), Yanggu (Sheep Bone), Yangzhizhu (Rhododendri Molleis Flos), Yuxingcao (unknown herb), Hetunyu Jiao (Fish Bladder Gelatin). Avoid sheep blood. It dissolves the Five Metals and Eight Stones.
Salty, bitter, pungent, hot. Toxic. It treats Zhengjia Rouji (Masses and fleshy accumulations), breaks up stagnant blood and stubborn phlegm, and can completely resolve chronic diseases of the Sanjiao (Triple Burner). Its nature can erode metals and stones and corrode the stomach and intestines; it is not suitable for internal use. If taken, it transforms the Heart into Blood.
The white and clean ones are superior. Processed by wet grinding (Shuifei) and boiled in vinegar until dry like frost, then scraped off for use.
For poisoning, grind fresh Lv Dou (Mung Bean) into juice and drink two or three sheng to detoxify.
Pengsha (Borax), also known as Pensha (Basin Sand).
Incompatible with Zhi Mu (Rhizoma Anemarrhenae), Yun Tai (Brassica Napus), Zi Su (Perilla Leaf), Zeng Dai (Steamer Strap), Heshouwu (Polygoni Multiflori Radix), E Bushi Cao (Herba Centipedae). It controls Mercury. Ya Tong (Dull Copper).
Sweet, slightly salty, cool. It treats upper Jiao Tan Re (Phlegm-Heat), Jiejie (Knots/Masses), Hou Bi (Sore Throat/Glossopharyngeal obstruction), Gu Geng (Bone Fishbone Lodgement), E Chuang Nu Rou (Malignant Ulcers and Polyps), Yi Zhang (Corneal Opacity), and various oral and dental diseases. Combined with Sheng Jiang Pian (Fresh Ginger Slices), dip and rub on Muthe (Wooden Tongue) swelling and stiffness. Combined with a small amount of Bingpian (Borneolum Syntheticum), ground into fine powder, apply with a rush stem to Nu Rou (Polyps) and Yi Zhang (Corneal Opacity). Combined with Yaxiao (Saltpeter/Niter), treat Yanhou Gezai Swelling and Pain (Severe Sore Throat). Combined with Baimei (White Plum), treat Yanhou Zhongtong (Sore Throat Swelling and Pain).
Produced in the Southwest. The western variety is white like Mingfan (Alum); the southern variety is yellow like Tao Jiao (Peach Gum).