味辛、苦，寒，无毒。主身热，胃中结气，四肢寒厥，利小便，通血脉，明目，去翳
眇，去三虫，杀蛊毒。止消渴，下气，除胁肋肺间邪气。久服不饥。一名方石，一名土石，
一名直石，理如马齿，方而润泽，玉色。生长子山谷及太山、临淄，采无时。
长子县属上党郡，临淄县属青州。俗方及《仙经》并无用此者也。
〔谨案〕此石状同石
膏而浓大，纵理而长，文似马
齿，今均州辽 山有之，土人以为理石者，是长石也。
味辛、咸，平，无毒。主蛊毒及蛇、菜肉诸毒，恶疮。不可久服，令人瘦。一名推青
，一名推石。生益州川谷。
俗方及《仙经》并无用此者，亦相与不复识之。
味辛、甘，平，无毒。主风热恶疮，疡疽疮痂，疥气在皮肤中。除胸膈中热气，食不
下，心烦，去黑子。一名铁液，可以染皂。生牧羊平泽及 城、或析城，采无时。
主坚肌耐痛。
味甘，平，无毒。主金创，烦满热中，胸隔中气塞，食不化。一名跳铁。
平，微温。主明目，化铜。疗惊悸，定心气，小儿风痫，阴溃，脱肛。
铁落，是染皂铁浆。生铁，是不破 、枪、釜之类。钢铁，是杂炼生镰，作刀、 者。
铁
轻者为佳，亦以摩莹铜器用也。
〔谨案〕单言铁者，镰铁也。铁落是锻家烧铁赤沸，砧上锻
之，皮甲落者也。甲乙子卷阳
厥条言之，夫诸铁疗病，并不入丸散，皆煮取浆用之。若以浆为铁落，钢生之汁，复谓何等？
落是铁皮，落液黑于余铁。
陶谓可以染皂，云是铁浆，误矣。又铁屑炒使极热，投酒中饮酒，疗贼风痉。又裹以熨腋，
疗狐臭有验。
[Changshi (Long Stone)]
Pungent and bitter in flavor, cold in nature, non-toxic. It primarily treats body heat, qi stagnation in the stomach, coldness and reversal of the four limbs, promotes urination, unblocks blood vessels, brightens the eyes, removes ocular nebulae (cataracts/opacities), expels three types of parasites, and kills gu poison. It stops thirst (xiao ke), directs rebellious qi downward, and eliminates pathogenic factors in the hypochondrium and between the lungs. Long-term consumption prevents hunger. Also known as Fangshi, Tushi, or Zhishi. Its texture resembles horse teeth, it is square and moist, with a jade-like color. It grows in the valleys of Changzi County, as well as Mount Tai and Linzi. It can be harvested at any time. Changzi County belongs to Shangdang Commandery, and Linzi County belongs to Qingzhou. Neither folk prescriptions nor the *Xianjing* (Scriptures of Immortals) record the use of this substance.
[Note] This stone has a shape similar to Shigao (Gypsum Fibrosum) but is denser and larger, with longitudinal grain and patterns resembling horse teeth. It is currently found in Liaoshan, Junzhou. Locals consider it Lishi (Calcitum), but it is actually Changshi.
[Tiejing (Iron Essence) I]
Pungent and salty in flavor, neutral in nature, non-toxic. It primarily treats gu poison, as well as various poisons from snake bites and ingested vegetables or meat, and malignant sores. It should not be taken for a long time, as it causes emaciation. Also known as Tuiqing or Tuishi. It grows in the river valleys of Yizhou.
Neither folk prescriptions nor the *Xianjing* record its use, and people no longer recognize it.
[Tiejing (Iron Essence) II]
Pungent and sweet in flavor, neutral in nature, non-toxic. It primarily treats malignant sores caused by wind-heat, ulcers, carbuncles, scabs, and the sensation of scabies qi within the skin. It clears hot qi from the chest and diaphragm, treats difficulty in swallowing food, irritability, and removes black spots. Also known as Tieye (Iron Liquid), it can be used to dye silk black. It grows in Yangmu Pingze, Cheng, or Xicheng. It can be harvested at any time.
[Tiejing (Iron Essence) III]
It primarily firms the muscles and increases tolerance to pain.
[Tiejing (Iron Essence) IV]
Slightly cold in nature. It primarily treats diseases of the lower part of the body and rectal prolapse.
[Tiejing (Iron Essence) V]
Sweet in flavor, neutral in nature, non-toxic. It primarily treats traumatic injuries from metal weapons, vexation and fullness with internal heat, qi obstruction in the chest and diaphragm, and indigestion. Also known as Tiaotie.
[Tiejing (Iron Essence) VI]
Neutral in nature, slightly warm. It primarily brightens the eyes, dissolves copper, treats palpitations and fright, stabilizes heart qi, treats childhood wind epilepsy, genital ulcerations, and rectal prolapse.
Tieluo (Iron Filings/Slag) refers to the iron slurry used for dyeing silk black. Shengtie (Raw Iron) refers to unbroken iron blocks, spearheads, cauldrons, etc. Gangtie (Steel) refers to iron mixed and smelted from raw iron and pig iron, used to make knives and farming tools.
Among iron substances, those that are lighter in weight are superior; they can also be used to polish and brighten copper vessels.
[Note] When simply referred to as "Tie" (Iron), it denotes sickle iron. Tieluo is the scale or skin that falls off when blacksmiths heat iron until red-hot and hammer it on an anvil. The *Jiayi Jing* (Systematic Classic of Acupuncture and Moxibustion), Volume 1, discusses Yangjue (Reversal of Yang). Treatments using iron do not enter pills or powders; instead, the decoction liquid is used. If the liquid is considered Tieluo, what would the juice produced by steel be called? Tieluo consists of iron scales, and its liquid is darker than that of other irons. Tao Hongjing stated it could dye silk black, calling it iron slurry, which is erroneous. Additionally, frying iron filings until extremely hot, immersing them in wine, and drinking the wine can treat wind-stroke spasms. Wrapping hot iron filings in cloth and applying them to the armpits is effective for treating osmidrosis (fox odor).