雷公云∶凡使，勿用草中取者、并旧朱漆中者、勿用经别药制过者、勿用在尸过者、半
生半死者。其水银若在朱砂中产出者，其水银色微红，收得后用胡芦收之，免遗失。若先以
紫背天葵并夜交藤自然汁二味，同煮一伏时，其毒自退。
若修十两，用前二味汁各七镒和合，煮足为度。
雷公云∶凡使，勿用方解石。方解石虽白，不透明，其性燥。若石膏，出剡州茗山县义
情山，其色莹净如水精，性良善也。
凡使之，先于石臼中捣成粉，以夹物罗过，生甘草水飞过了，水尽令干，重研用之。
雷公云∶银气凡使，在药中用时，即浑安置于药中，借气生药力而已。
勿误入药中用，消人脂也。
雷公云∶铁气凡使，在药中用时，即浑安置于药中，借气生药力而已。
勿误入药中用，消人脂也。
雷公云∶金气凡使，在药中用时，即浑安置于药中，借气生药力而已。
勿误入药中用，消人脂也。
雷公云∶凡使，勿误用玄中石并中麻石。此石之二真相似磁石，只是吸铁不得。中麻石
心有赤，皮粗，是铁山石也。误服之，令人有恶疮，不可疗。夫欲验者，一斤磁石，四面只
吸铁一斤者，此名延年沙；四面只吸得铁八两者，号曰续未石；四面只吸得五两已来者，号
曰磁石。
若夫修事一斤，用五花皮一镒、地榆一镒、故绵十五两，三件并细锉，以捶于石上碎作
二、三十块，了，将磁石于瓷瓶子中，下草药，以东流水煮三日夜，然后漉出，拭干，以布
裹之，向大石上再捶令细了，却，入乳钵中研细如尘，以水沉飞过了，又研如粉用之。
雷公说：凡是使用水银，不要选用从草丛中采集的，也不要选用来自旧朱漆容器中的，不要选用经过其他药物炮制过的，不要选用在尸体上放置过的，以及半生半死的。如果水银是从朱砂中产出的，其颜色微红，采收后应用葫芦来盛装，以防流失。如果先用紫背天葵和夜交藤的自然汁液这两味药，共同煮一个时辰（一伏时），其毒性自然消退。
如果要炮制十两水银，使用前两种汁液各七镒混合，煮至足量为止。
雷公说：凡是使用磁石，不要选用方解石。方解石虽然白色，但不透明，其性质燥烈。如果是石膏，出产于剡州茗山县义情山，其颜色晶莹洁净像水晶一样，性质良善温和。
凡是要使用磁石，先在石臼中捣成粉末，用筛网过滤，再用生甘草水飞研处理，待水分干尽后，再次研磨使用。
雷公说：银气在使用时，将其整体放置在药物中，借助其气味来增强药力即可。切勿误将银气直接混入药物服用，否则会消耗人的脂肪。
雷公说：铁气在使用时，将其整体放置在药物中，借助其气味来增强药力即可。切勿误将铁气直接混入药物服用，否则会消耗人的脂肪。
雷公说：金气在使用时，将其整体放置在药物中，借助其气味来增强药力即可。切勿误将金气直接混入药物服用，否则会消耗人的脂肪。
雷公说：凡是使用磁石，切勿误用玄中石和中麻石。这两种石头与磁石非常相似，只是不能吸引铁。中麻石中心呈红色，表皮粗糙，属于铁山石。误服后会让人患上恶疮，无法治愈。如果要验证真伪，一斤磁石，四面总共能吸住一斤铁的，名叫“延年沙”；四面总共能吸住八两铁的，名叫“续未石”；四面总共只能吸住五两及以下的，才叫“磁石”。
如果要炮制一斤磁石，需用五花皮一镒、地榆一镒、旧绵十五两，将这三味药切碎，并在石头上捶打成二三十块碎片。然后，将磁石放入瓷瓶中，加入草药，用东流水煮三天三夜，然后捞出，擦干，用布包裹，在大石头上再次捶打使其变细，最后放入乳钵中研磨成如灰尘般的细粉，用水飞研法处理，再研磨成粉备用。
Lei Gong said: When using Mercury (Shuiyin, 水银), do not use that collected from grass, nor that from old cinnabar lacquer containers. Do not use that processed by other medicines, nor that placed over corpses, or that which is half-raw and half-dead. If the mercury is produced within Cinnabar (Zhusha, 朱砂), its color will be slightly red; upon collection, store it in a gourd to prevent loss. If first boiled for one *fu* period (approximately 12 hours) with the natural juices of two herbs, *Zi Bei Tian Kui* (Oxalis corniculata var. purpurea) and *Ye Jiao Teng* (Polygoni Multiflori Caulis), its toxicity will naturally subside.
To process ten taels of mercury, mix seven yi units each of the aforementioned two juices, and boil until sufficient.
Lei Gong said: When using Magnetite (Cishi, 磁石), do not use Calcite (Fangjieshi, 方解石). Although Calcite is white, it is not transparent and has a dry nature. Gypsum (Shigao, 石膏), however, originates from Yiqing Mountain, Ming Shan County, Yan Zhou; its color is crystal clear like rock crystal, and its nature is benign and gentle.
When processing Magnetite, first pound it into powder in a stone mortar, sieve it through a fine mesh, then levigate it with water mixed with Raw Licorice Root (Sheng Gancao, 生甘草). Allow the water to evaporate completely, then grind again before use.
Lei Gong said: When using Silver Qi (Yinqi, 银气), place the whole piece among the medicinal ingredients to borrow its qi to enhance the medicinal power. Do not mistakenly ingest it directly, as it consumes human body fat.
Lei Gong said: When using Iron Qi (Tieqi, 铁气), place the whole piece among the medicinal ingredients to borrow its qi to enhance the medicinal power. Do not mistakenly ingest it directly, as it consumes human body fat.
Lei Gong said: When using Gold Qi (Jinqi, 金气), place the whole piece among the medicinal ingredients to borrow its qi to enhance the medicinal power. Do not mistakenly ingest it directly, as it consumes human body fat.
Lei Gong said: When using Magnetite, do not mistake Xuanzhong Stone (Xuanzhongshi, 玄中石) or Zhongma Stone (Zhongmashi, 中麻石) for it. These two stones resemble Magnetite but cannot attract iron. Zhongma Stone has a red center and rough skin; it is an iron mountain stone. Ingesting it mistakenly causes malignant sores that are incurable. To verify authenticity: if one jin of Magnetite attracts one jin of iron from all four sides, it is named "Longevity Sand" (Yannian Sha); if it attracts eight liang of iron, it is called "Xuwei Stone"; if it attracts five liang or less, it is simply called "Magnetite".
To process one jin of Magnetite, use one yi unit of Wuhua Pi (Bark of Five-flower Vine), one yi unit of Diyu (Sanguisorbae Radix), and fifteen liang of old silk floss. Finely chop these three items, crush them into twenty or thirty pieces by pounding on a stone. Place the Magnetite in a porcelain bottle, add the herbal materials, and decoct with flowing water from the east for three days and nights. Then strain, wipe dry, wrap in cloth, and pound again on a large stone until fine. Finally, grind in a mortar until dust-like, levigate with water, and grind into powder for use.