雷公云∶水中生火，非KT 髓而莫能。
海中有兽，名曰KT ，以髓入在油中，其油沾水，水中生火，不可救之，用酒喷之即
。
勿于屋下收。
雷公云∶凡使，须去蒂并向里子后，取皮，用茱萸同于 上缓炒，待茱萸微黄黑，即去
茱萸，取草豆蔻皮及子，杵用之。
雷公云∶凡使，勿用柚皮、皱子皮，其二件用不得。
凡修事，须去白膜一重，细锉，用鲤鱼皮裹一宿，至明，出，用。
其橘皮，年深者最妙。
雷公云∶凡使，用东流水淘去黄叶并皮、蒂，尽了，用酒蒸一宿，以东流水淘两遍，又
晒干方用为妙也。
雷公云∶凡使，有四件。八棱者，两头尖、色紫黑者，又呼胡麻，并是误也；其巨胜有
七棱，色赤、味涩酸是真；又呼乌油麻，作巨胜，亦误。
若修事一斤，先以水淘，浮者去之，沉者漉出，令干，以酒拌蒸，从巳至亥，出，摊晒
干；于臼中，舂令粗皮一重尽；拌小豆相对同炒，小豆熟即出，去小豆用之。上有薄皮，去
、留用，力在皮壳也。
雷公云∶凡使，勿用白瓜蒂，要采取青绿色瓜，待瓜气足，其瓜蒂自然落在蔓茎上。
夫采得，未用时，使榔榔叶裹，于东墙有风处挂令吹干用。
雷公云∶瓜子凡使，勿用瓜子实，恐误。
夫采得后，便于日中曝令内外干，便杵，用马尾筛筛过，成粉末了用。
Lei Gong said: Fire generating from water, apart from [Guizi Sui / KT Marrow] (a specific medicinal material, likely a textual corruption or specific term), no one else can achieve it.
There is a beast in the sea named [Guizi / KT]. Its marrow exists within its oil. When this oil touches water, it generates fire on the water surface and cannot be extinguished by water; only spraying with wine can put it out.
Do not collect (process) under the eaves of a house.
Lei Gong said: Whenever using [Guizi], one must remove the calyx and the inner seed portion, taking only the peel. Stir-fry it slowly over heat together with Evodiae Fructus (Wuzhuyu). When the Evodiae Fructus turns slightly yellowish-black, remove the Evodiae Fructus. Take the peel and seeds of Amomi Fructus Rotundus (Caodoukou), pound them, and use them.
Lei Gong said: Whenever using [Guizi], do not use Pomelo Peel (Youpi) or wrinkled peel (Zhouzi); these two types are unusable.
Whenever processing, one must remove a layer of white membrane, finely chop it, wrap it in Carp Skin (Liyupi) for one night. The next morning, take it out and use it.
Among Tangerine Peel (Jupi), the older the age, the better.
Lei Gong said: Whenever using [Guizi], wash it with flowing water from the east to remove yellow leaves, peels, and calyces until clean. Then steam it with wine for one night. Wash it twice more with flowing water from the east, dry it in the sun, and then it is best to use.
Lei Gong said: Whenever using [Guizi], there are four categories to distinguish. Those with eight ridges, pointed at both ends, and purple-black in color, also called Sesame (Huma), are mistaken identities. The true Jusheng (Sesamum indicum, Black Sesame) has seven ridges, is reddish in color, and has a astringent and sour taste. Calling it Wuyouma (Black Oil Sesame) and treating it as Jusheng is also an error.
If processing one jin (approx. 500g), first wash with water. Discard floating ones, retrieve sunken ones, and let them dry. Mix with wine and steam from Si hour (9-11 AM) to Hai hour (9-11 PM). Take out and spread to dry. Pound in a mortar until the outer coarse skin is completely removed. Stir-fry together with Adzuki Beans (Xiaodou). When the beans are cooked, take out, discard the beans, and use the seeds. There is a thin skin on top; remove [impurities/keep as per efficacy in shell], as the potency lies in the shell.
Lei Gong said: Whenever using [Guizi], do not use White Melon Calyx (Baiguadi). One should harvest green melons. Wait until the melon's qi is sufficient, so that the calyx naturally falls onto the vine stem.
After harvesting, before use, wrap them in Langlang Leaves (Langlangye). Hang them in a windy place on the east wall to dry by air.
Lei Gong said: Whenever using Guazi (Melon Seeds), do not use the kernel/seed meat (Shi), lest confusion arise.
After harvesting, expose them to the sun to dry thoroughly inside and out. Then pound them. Sieve through a horse-hair sieve until they become powder, and then use.