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Zaofan (Vitriol), also known as Lvfan (Green Vitriol).
Astringent, dries dampness, transforms phlegm.
Sour induces vomiting, astringent retains. Its functions of drying dampness, transforming phlegm, detoxifying, and killing parasites are the same as Shifan (Alum Stone), but its potency is milder. Its indications are roughly similar to Baifan (White Alum): it promotes urination, resolves food stagnation (formulated into pills with spleen-fortifying and digestion-promoting herbs), disperses throat obstruction (mixed with vinegar and swallowed as juice. Li Shizhen said: It is often used in formulas for treating abdominal distension, yellow swelling, malaria-dysentery, and childhood malnutrition. Its origin stems from changes derived from Zhang Zhongjing's formula using Alum Stone and Niter to treat female-labor jaundice). Those that are deep blue, bright, and pure are superior.
The red variety is called Jiangfan (Crimson Vitriol); it enters the blood level, subdues Liver Wood, and dries Spleen dampness. Zhang Sanfeng treated swelling and distension with Famu Wan (Wood-Subduing Pill): Cangzhu (Atractylodis Rhizoma) 2 jin, soaked in rice wash water, moistened with yellow wine, stir-fried with Siangqu (Bread Qu) 4 liang; add Jiangfan 1 jin, mix with vinegar, dry, place in a bottle, calcine to powder, make pills with vinegar paste, take with wine. Or remove Zaofan, as it is the essence of copper; processed with vinegar to calm the Liver, it is superior to needle iron. There is no need to avoid salt; even if taken later, it will not recur. Excessive intake causes diarrhea.

This is Rongyan (Rong Salt).
Tonifies the Kidney, clears blood heat.
Sweet, salty, and cold. Enters the Kidney meridian, assists the Water organ, and calms blood heat. Treats eye pain, redness, and dryness; hematemesis, hematuria, bleeding from teeth and tongue; strengthens bones and teeth (good for brushing teeth), brightens eyes, and darkens beard. Its other properties are the same as Shiyan (Table Salt); it originates from the Western Qiang region. It does not require boiling or refining; those with square edges, bright and translucent, and greenish color are superior.

(Xiyan / Table Salt)
Clears heat, moistens dryness, tonifies the Heart, unblocks both bowels, disseminates, and induces vomiting.
Salty, sweet, acrid, and cold. Salty and descending, thus it unblocks large and small intestines; salty moves into blood and cold overcomes heat, thus it treats red eyes, carbuncles and sores, blood heat, and heat diseases; salty tonifies the Heart, thus it treats Heart deficiency (using water to control fire, taking the meaning of Ji Ji [Already Fulfilled], so Heart-tonifying herbs are often fried with salt. One person suffered from incessant laughter; he drank boiled decoction of salt and Chi Xiaodou [Vigna angularis] and recovered. The Classic says: When Shen [Spirit] is excessive, there is incessant laughter. Shen is the Heart Fire. Using salt is using water to control fire. A woman suffered from this for half a year; Zhang Hezi also cured her with this method); salty enters the Kidney and governs bones (so Kidney-tonifying herbs are often taken with salt water), thus it strengthens muscles and bones, treats bone diseases and toothache (brushing teeth is also good, clearing fire and strengthening teeth. For bleeding from gum spaces, apply thick salt water to the gums at night, wait until saliva drains completely, then sleep. Someone asked: Salty can soften hardness, how can it strengthen muscles and bones? Not knowing that bone resorption and tendon laxity are all due to damp-heat; when heat dominates internally, treat with salty-cold; for example, raw meat rots easily, but encountering the salty-cold nature of salt makes it firm and lasting without decay); salty moistens dryness and acrid dissipates Lung Qi (salt is refined using Zaojiao [Gleditsia Sinensis] to collect it, so the taste is slightly acrid), thus it treats phlegm-fluid retention causing wheezing and counterflow (Ben Jing says: treats wheezing. Only asthma cases should avoid it); salty softens hardness, thus it treats tubercles and accumulations. It can also induce vomiting and sober up from alcohol (water overcomes fire), detoxify (fire-heat is toxicity; it can dissipate fire and cool blood), kill parasites (the General of West Zhejiang suffered from earthworm poison, feeling worms singing in his body every evening; a monk taught him to bathe in salt water, and he recovered after several times), relieve pain and stop itching (body feels like insects crawling, which is wind-heat; bathing in salt water three or four times is good. It also treats all kinds of wind conditions. For scalds and burns, immediately sprinkle raw salt to protect the flesh from decaying, then apply medicine).
Excessive consumption injures the Lung, moves into blood, seeps fluids causing thirst (The Classic says: Salty moves into blood; those with blood diseases should not eat much salty food. Eating salty causes dry mouth because it seeps the fluids in the Stomach). It is strictly contraindicated for those with blood diseases, asthma, edema, and Xiao Ke (Wasting-Thirst) (There are many types of salt: salts in Jianghuai north and south are produced from the sea; salt in Xiezhou, Shanxi, is produced from pools; salt in Sichuan and Yunnan is produced from wells; Rong salt is produced from soil; Guangming Salt [Bright Salt] is produced either from cliffs in Jiazhou or from salt pools in Wuyuan. It looks like crystal, requires no boiling or refining, also known as Crystal Salt; Shiyan [Stone Salt] is produced from stones; Muyan [Tree Salt] is produced from trees; Pengyan [Mound Salt] is produced from grass. The wonders of creation are truly inexhaustible).