出西戎，形块方棱如石，明莹而青。戎盐。
咸，寒，无毒。坚骨固齿，明目乌须。助水脏而平血热，消症积而除疥癣；止吐尿舌齿
诸血
治同食盐。
姜汁煮，研粉用。
甘，寒，无毒。凉血降火，坚牙明目，退热消积，除烦解渴。
生于卤地积盐之下，精液渗于土中，年久至泉，结而成石，清莹如水晶。
咸，寒，无毒。治上盛下虚，救阳助阴，有扶危拯逆之功。
咸卤精液，流渗入土，年久结成石片，状如龟背之形，大者如杏叶，小者如鱼鳞。
乃皮硝炼成者。石苇为使，恶三棱。煎炼成棱者，曰马牙硝。
辛，苦，咸，寒，无毒。入手少阴心、足太阳膀胱经。利二便而破五淋，退壅热而除留
血，化积聚而坠痰结，通经
脉而下胎孕。平瘰 而明目，息黄胆而消肿。
硝有三品∶生川蜀曰川硝，最胜；生河东曰盐硝，次之；生河北、青、齐者曰土硝。皆
生于
汁，经宿结成，犹有沙土猥杂，故名朴硝。一经煎炼，澄去渣脚，则成芒硝。
腹中痞块，同大黄、独头蒜捣饼贴之，以消为度。（验方第一。）
口舌疮红，含之良。（第二。）
丹毒如火，水合敷之。（第三。）
碧雪 芒硝 皮硝 石膏 寒水石（水飞，各一斤） 甘草（一斤，煎汁去渣）
入诸药同煎，搅之令化。再入青黛一斤，和匀，经宿结成。或含咽，或吹之，或煎服。
治一
肿口疮等症。（诸方第一。）
产于西戎地区，形状呈块状且四方有棱，像石头一样，明亮晶莹且颜色发青。即戎盐。
味道咸，性寒，无毒。能坚固骨骼、稳固牙齿，使眼睛明亮、头发乌黑。辅助肾脏（水脏）并平息血热，消除症瘕积聚并去除疥癣；治疗吐血、尿血、舌出血及齿出血等各种出血症状。其功效与食盐相同。
用姜汁煮后，研磨成粉末使用。
味道甘，性寒，无毒。能凉血降火，坚固牙齿、明亮眼睛，退热消积，除烦解渴。
生长在含盐碱的土地上，位于积盐的下方，精液渗入土中，年代久远到达泉水处，凝结而成石块，清澈晶莹如同水晶。
味道咸，性寒，无毒。治疗上实下虚之证，救助阳气、辅助阴液，具有扶正救逆的功效。
咸卤的精液，流动渗入泥土，年代久远结成石片，形状像龟背，大的如杏叶，小的如鱼鳞。
这是由皮硝炼制而成的。以石苇为引经药，畏三棱。经过煎炼形成棱角状的，称为马牙硝。
味道辛、苦、咸，性寒，无毒。归入手少阴心经和足太阳膀胱经。通利大小便并破除五种淋证，退去壅滞之热并去除留瘀之血，化解积聚并坠下痰结，疏通经脉并促使胎孕下行。平息瘰疬并明亮眼睛，消退黄疸并消肿。
硝分为三种：产于川蜀地区的叫川硝，品质最佳；产于河东的叫盐硝，次之；产于河北、青州、齐地的叫土硝。这些硝都生于汁液中，经过一夜凝结而成，其中还混杂着沙土杂质，所以名叫朴硝。一旦经过煎炼，澄清并去除沉淀渣脚，就成为了芒硝。
腹部有痞块，可与大黄、独头蒜一起捣烂做成饼贴敷患处，直到痞块消散为止。（验方第一。）
口舌生疮红肿，含服此药效果良好。（第二。）
碧雪（配方：芒硝、皮硝、石膏、寒水石各一斤，均经水飞处理；甘草一斤，煎取汁液去渣），将诸药一同煎煮，搅拌使其溶解。再加入青黛一斤，混合均匀，过夜凝结而成。可以含化咽下，或吹入患处，或煎汤服用。治疗各种肿毒、口疮等症状。（诸方第一。）
Originating from the Western Regions (Xirong), it appears in blocky, square-prismatic shapes resembling stone, bright and translucent with a bluish-green hue. Also known as Rongyan (Rong Salt).
Salty, cold, non-toxic. Strengthens bones and secures teeth, brightens the eyes, and darkens hair. Assists the Kidney (Water Zang) to calm blood heat, resolves masses and accumulations, and eliminates scabies and tinea; stops bleeding from vomiting, urination, tongue, and teeth. Its therapeutic actions are identical to those of common salt.
Boil with ginger juice, then grind into powder for use.
Sweet, cold, non-toxic. Cools blood and descends fire, strengthens teeth and brightens eyes, reduces fever and dissipates accumulations, relieves irritability and quenches thirst.
Grows in saline-alkali lands, beneath accumulated salt deposits. The essence seeps into the soil, and over many years reaches underground springs, condensing into stones that are clear and lustrous like crystal.
Salty, cold, non-toxic. Treats conditions of excess above and deficiency below, rescues Yang and assists Yin, possessing the merit of supporting critical cases and reversing adverse conditions.
The essence of salty brine flows and seeps into the earth, condensing over long periods into stone flakes shaped like a turtle’s back. Large pieces resemble apricot leaves, while small ones resemble fish scales.
This is refined from Pixiao (Crude Natrium Sulfate). Shiwei (Pyrrhosiae Herba) serves as the guiding herb; it is incompatible with Sanleng (Sparganii Rhizoma). Those that form prismatic shapes after decoction and refining are called Mayaxiao (Horse Tooth Nitre).
Pungent, bitter, salty, cold, non-toxic. Enters the Hand-Shaoyin Heart Meridian and the Foot-Taiyang Bladder Meridian. Promotes urination and defecation, breaks through five types of strangury, clears stagnant heat and removes retained blood, transforms accumulations and drops phlegm nodules, unblocks meridians, and induces abortion. Resolves scrofula and brightens the eyes, alleviates jaundice and reduces swelling.
Nitre is categorized into three grades: Chuanxiao produced in Sichuan and Shu regions is the finest; Yanxiao produced in Hedong is second best; Tuxiao produced in Hebei, Qingzhou, and Qizhou is third. All originate from juices that crystallize overnight, still containing impurities such as sand and soil, hence named Puxiao (Unrefined Natrium Sulfate). Once decocted and refined, clarifying and removing the sediment, it becomes Mangxiao (Mirabilite).
For abdominal痞块 (masses/lumps), combine with Dahuang (Rhei Radix et Rhizoma) and single-clove garlic, pound into a paste, apply externally until the mass dissipates. (Verified Formula 1.)
For red sores on the mouth and tongue, hold in the mouth; this is effective. (Formula 2.)
For erysipelas resembling fire, mix with water and apply externally. (Formula 3.)
Bixue (Prescription: Mangxiao, Pixiao, Shigao [Gypsum Fibrosum], Hanshuishi [Aqua Calcitae] each one jin, all processed by water levigation; Gancao [Glycyrrhizae Radix et Rhizoma] one jin, decocted to extract juice and remove dregs). Decoct all herbs together, stir to dissolve. Add Qingdai [Indigo Naturalis] one jin, mix evenly, and allow to crystallize overnight. Can be held in the mouth to swallow, insufflated into the lesion, or decocted for oral administration. Treats various swellings, mouth sores, and other symptoms. (General Formulas 1.)