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[Shizhong Huangzi (Yellow Substances in Stone)]
Sweet in taste, neutral in nature, non-toxic. Long-term consumption can make the body feel light, prolong life, and retard aging. This substance belongs to the interior of the shell of Yuyuliang (Haematitum), which is the yellow turbid liquid before it forms into Yuyuliang. It is found in places where Yuyuliang is produced. Tao Hongjing stated that Shizhong Huangzi exists within the category of Zhi (Lingzhi/Ganoderma), which is incorrect. (Newly added)

[Yuyuliang (Haematitum)]
Sweet in taste, cold and neutral in nature, non-toxic. It primarily treats cough with inverted qi, alternating chills and fever, mental restlessness and fullness, dysentery with red and white discharge, amenorrhea (blood closure), zhengjia masses (abdominal masses), high fever, and alleviates painful stagnation in the lower abdomen. After processing and taking it, one will not feel hungry, the body becomes light, and life is prolonged. Also known as Bai Yuliang (White Yuyuliang). It grows in the pools and marshes of the East Sea, as well as in mountain islands or within pools and marshes.
Currently, it is mostly produced in Dongyang. Its shape resembles goose or duck eggs, with overlapping shells on the outside and fine yellow powder resembling Puhuang (Tylphae Pollen) inside; those without sand are considered superior. In recent years, large quantities of extremely high-quality specimens with a graceful purple luster were obtained by excavating the ground at Maoshan. The "Xian Jing" (Scripture of Immortals) records its use for ingestion. People in the south also refer to a vine growing in flat marshes, whose leaves resemble Bqie (Smilax glabra), and whose rhizomes are nodular and tuberous, similar to Bqie but reddish in color, with roots resembling Dioscorea, calling it Yuyuliang. They claim that when Yu the Great traveled through the mountains and lacked food, he gathered this plant to sustain himself, and what is referred to as "Taiyi" is indeed this plant. Zhang Hua said: "Where there are many Polygonum hydropiper (Liao) in ponds, there must be Yuyuliang," which is the case in the Lujiang region. Recently, someone mining Kongqing (Azurite) in stone pits at Tongguan found large amounts of yellow-red stones that closely resembled current Yuyuliang but were even redder and better, suspecting them to be Taiyi. Locals called them Xihuang (Realgar-like Orpiment); testing them by smearing on objects yielded a color exactly like Xionghuang (Realgar).
[Note] Tao Hongjing said: "The yellow-red stone is suspected to be Taiyi." Since it lacks a shell wrapping, it is not Yuyuliang; suspecting it to be Taiyi is indeed an imprecise designation.

[Jin Xie (Gold Dust/Flakes)]
Pungent in taste, neutral in nature, toxic. It primarily calms the spirit, strengthens the bone marrow, promotes the free flow of the five zang organs, eliminates pathogenic toxic vapors, and consumption leads to immortality. It is produced in Yizhou, and can be harvested at any time.
Sources of gold are ubiquitous. Liangzhou, Yizhou, Ningzhou, and Jianjin have abundant supplies. Extracted from river sands, appearing as flakes, it is called Sheng Jin (Raw Gold). It has the property of warding off evil but is toxic; consuming it unrefined can be fatal. Jianjin also produces Jin Sha (Gold Sand) from rocks, which is smelted and cast into crucibles; although fired, it is not yet fully mature and requires further refining. Additionally, gold vessels from Goguryeo, Funan, and other Western Regions countries are all refined and suitable for consumption. The "Xian Jing" describes refining gold dust with honey, pork fat, Vitex negundo, and wine to create soft pills for ingestion, leading to immortality. Apart from being combined with mercury to make Cinnabar (Dan Sha), it is rarely used in medical prescriptions, likely due to concerns about its toxicity. The "Xian Fang" (Immortal Prescriptions) refers to gold as Taizhen.