Minium (Lead Oxide) (Huang Dan) (Orange-yellow to red, heavy fine powder, dyes fingers orange-yellow)
【Name】n
n 【Source】n
Shen Nong’s Herbal Classic, Lower Grade
n 【Frequency of Use】n
E
n 【Botanical Origin】n
Tetra lead trioxide Pb3O4, produced by processing pure lead.
n 【Characteristics】n
It is a heavy, fine powder of orange-yellow or orange-red color, sometimes crystallized in the rhombic crystal system; it has a dull luster and is opaque. It feels smooth and delicate to the touch, without a rough feel, and can dye the fingers orange-yellow. Specific gravity 8~9.2, hardness 2, melting point 1~1.5, easily melts into a glassy substance.
n 【Identification】n
“Medical Formulas Classified According to Type”: “High-quality Huang Dan is fine and will not fall when thrown on a wall.” It is best if it is a fine powder, smooth, without coarse particles, and does not form lumps when it comes into contact with water.
n 【Category】n
Minerals