味苦、辛，微毒，亦能接骨理伤，功用与自然铜相等，第其性有毒耳。《本经》主
贼风反折者，风气通于肝，肝属木，金能平之故也。其力能焊人骨，凡六畜有损，细研
酒服，直入骨损处，六畜死后取骨视之，犹有焊痕可验。定州崔务堕马折足，医者取铜
末和酒服之遂瘥，及亡后十年改葬视其胫骨折处，犹有铜束之也。但打熟铜不堪用。
赤铜屑，主贼风反折，烧赤铜，五斤、纳酒二斗中，百遍服之。
禀土金之气以生，故味辛，平，无毒。产于有铜山中，采得方圆不定，其色青黄如
铜，不从矿炼，故号自然铜，入药火 醋淬七次，研细，水飞过，用乃入血行血，续筋
接骨之神药也。凡折伤则血瘀而作痛，辛能散瘀滞之血，破积聚之气，则痛止而伤自和
也，故主消瘀血排脓。续筋骨，并治产后血邪，止惊悸而安心，以酒磨服者，可谓悉其
用矣。昔有人以自然铜饲折翅胡雁，后遂飞去。今人打扑损伤，研细水飞过，同当归、
没药各半钱，以酒调服，仍以手摩疼处，实时见效。又有同乳香、没药、 虫五铢，古
钱、麻皮灰、血竭、胎骨作丸，煎当归、地黄、续断、牛膝、牡丹皮、红花，浓汤送
下，治跌扑损伤，或金刃伤骨断筋者最效。但中病即已，不可过服，以其有火金之毒，
有病病当之，病减恐真气走散耳。
自然铜，疗跌损，接骨续筋，折伤散血止痛。火 醋淬，热酒调服，立建奇功。然
治产后，恐血气大虚，非金石药所宜。
赤铜屑：味苦、辛，有微毒，也能接骨疗伤，功效与自然铜相当，只是它的性质有毒罢了。《神农本草经》记载它主治贼风引起的肢体反折痉挛，这是因为风气通应于肝，肝属木，金能克制木的缘故。赤铜屑的力量能够焊接人的骨头，凡是六畜（牛马羊鸡狗猪）有损伤，将其细细研磨后用酒送服，药力会直达骨骼受损之处，六畜死后取出骨头查看，仍有焊接的痕迹可以验证。定州的崔务从马上摔下导致腿骨折断，医生取铜末和酒让他服用，于是痊愈；在他去世十年后改葬时查看他的胫骨骨折处，仍然可以看到被铜屑束缚的痕迹。但是经过反复捶打的熟铜不堪使用。赤铜屑，主治贼风引起的肢体反折痉挛，将烧红的铜放入两斗酒中，浸泡一百遍后服用。
自然铜：禀受土和金的气化而生，所以味道辛，性平，无毒。产于有铜的山中，采集到的形状方圆不定，颜色青黄像铜一样，不是从矿石中冶炼出来的，所以叫自然铜。入药时需先用火煅烧再用醋淬炼七次，研成细粉，用水飞法处理过才能使用。它是入血分、行血气、续筋骨、接断骨的灵丹妙药。凡是折伤则血液瘀滞而疼痛，辛味能消散瘀滞之血，破除积聚之气，那么疼痛停止而伤势自然愈合，所以它能消除瘀血、排脓、续接筋骨，并治疗产后血邪，止住惊悸以安定心神，用酒磨服，可以说是完全发挥了它的作用。过去有人用自然铜喂养翅膀折断的大雁，后来大雁便飞走了。现在人遇到跌打损伤，将自然铜研细水飞后，与当归、没药各半钱，用酒调服，同时用手按摩疼痛部位，立刻见效。又有将自然铜同乳香、没药、䗪虫五铢，古钱币、麻皮灰、血竭、胎骨制成丸剂，用当归、地黄、续断、牛膝、牡丹皮、红花煎煮的浓汤送下，治疗跌打损伤，或是金刃造成的骨折筋断者最为有效。但病愈即止，不可过量服用，因为它含有火金的毒性，是借药物之毒来攻治病邪，病情减轻后恐怕会导致真气散失。
自然铜，治疗跌打损伤，接骨续筋，折伤散血止痛。用火煅醋淬，热酒调服，立即建立奇功。然而治疗产后疾病时，恐怕患者气血大虚，不适合使用金石类药物。
Chi Tong Xie (Red Copper Filings): Bitter and pungent in taste, slightly toxic. It can also set bones and heal injuries, with efficacy equal to that of Zi Ran Tong (Natural Pyrite), but its nature is toxic. *Shen Nong Ben Cao Jing* records it as the primary treatment for "zei feng" (thief wind) causing limb spasms and reversal, because wind qi communicates with the Liver; the Liver belongs to Wood, and Metal can subdue Wood. Its power is sufficient to weld human bones. For any injury to livestock, when finely ground and taken with wine, the medicinal force enters directly to the site of bone damage. After the animal dies, if the bones are examined, welding marks remain as verification. Cui Wu from Dingzhou fell from a horse and fractured his leg. The physician took copper filings mixed with wine for him to ingest, and he recovered. Ten years after his death, during exhumation, the fracture site of his tibia still showed traces of copper binding. However, repeatedly hammered soft copper is unsuitable for use. Chi Tong Xie primarily treats thief wind causing limb spasms. Heat red copper until red-hot, place five jin into two dou of wine, let it steep for a hundred cycles, then take orally.
Zi Ran Tong (Natural Pyrite): Born inheriting the qi of Earth and Metal, therefore its taste is pungent, nature is neutral, and it is non-toxic. It is produced in mountains containing copper. The collected pieces vary in shape and size, appearing greenish-yellow like copper. Since it is not smelted from ore, it is called Zi Ran Tong. For medicinal use, it must be calcined by fire and quenched in vinegar seven times, ground into fine powder, and processed by water flotation before use. It is a miraculous herb for entering the blood level, promoting blood circulation, reconnecting tendons, and setting broken bones. In cases of fractures or trauma, blood stasis causes pain. The pungent flavor can dissipate stagnant blood and break up accumulated qi, thereby stopping pain and allowing the injury to heal naturally. Thus, it eliminates blood stasis, expels pus, reconnects bones and tendons, and treats postpartum blood pathogenic factors. It stops palpitations and calms the mind. Taking it prepared with wine fully utilizes its properties. Once, someone fed Zi Ran Tong to a wild goose with a broken wing, and the goose subsequently flew away. Currently, for people suffering from contusions and injuries, Zi Ran Tong is finely ground and water-flown, then combined with equal parts (half qian each) of Dang Gui (Angelica Sinensis Root) and Mo Yao (Myrrh). It is taken with wine while massaging the painful area, yielding immediate results. Another prescription combines Zi Ran Tong with Ru Xiang (Frankincense), Mo Yao (Myrrh), E Chong (Asellus), ancient coins, hemp husk ash, Xue Jie (Dragon's Blood), and fetal bone, formed into pills. These are taken down with a strong decoction of Dang Gui (Angelica Sinensis Root), Di Huang (Rehmannia Root), Xu Duan (Dipsacus Root), Niu Xi (Achyranthes Root), Mu Dan Pi (Moutan Cortex), and Hong Hua (Carthamus Flower). This is most effective for treating contusions and injuries, or tendon severance and bone fractures caused by sharp weapons. However, discontinue use once the disease is cured; do not overdose, as it contains the toxicity of Fire and Metal. It works by using the drug's toxicity to attack the pathogen; if taken excessively after symptoms subside, it may cause the loss of healthy qi.
Zi Ran Tong treats contusions and injuries, sets bones, reconnects tendons, disperses blood stasis, and relieves pain from fractures. Calcined and quenched in vinegar, taken with warm wine, it achieves remarkable results instantly. However, in treating postpartum conditions, where qi and blood are often severely deficient, metallic minerals are generally inappropriate.