Yuncheng Salt Lake Black Mud

Yuncheng Salt Lake Black Mud

Yuncheng Salt Lake Black Mud is a protected geographical indication product.

　　Yuncheng Salt Lake Black Mud

　　 Located in Yuncheng Salt Lake, Yanhu District, Yuncheng City, Shanxi Province, the area stretches from Dongguo Town in the east, along the northern slope of the Zhongtiao Mountain, westward through Xiyao Town and Dizhang Village in Xiezhou Town. It extends north from Anyi Town, along the southern part of the urban area, westward through the Nancheng Subdistrict, Xicheng Subdistrict, and the southern part of Longju Town, reaching Qiaojiazhuang in Chepan Town in the west, covering a total area of 154.6 square kilometers

　　 “Request from the People's Government of Yanhu District, Yuncheng City Regarding the Demarcation of the Protected Production Area Scope for the Geographical Indication Product – Yuncheng Salt Lake Black Mud,” YNYZQ [2012] No. 20

　　 Enterprise Standard of Nafine Chemical Group Co., Ltd.: Q/NFJ 03-063-2012 “Yuncheng Salt Lake Black Mud”

　　Quality and Technical Requirements for Yuncheng Salt Lake Black Mud

　　I. Requirements for Raw Materials and Auxiliary Materials

　　1. Raw Material: Deep immature black mud extracted from within the production area’s salt lake.

　　2. Auxiliary Materials: Antioxidants and skin care agents must comply with relevant national cosmetics laws and regulations.

　　II. Production Process

　　Mud extraction → drying → crushing → sterilization → formulation → inspection → packaging → finished product.

　　III. Process Requirements

　　1. Drying: Natural air-drying method, moisture content (wt%) ≤ 3%.

　　2. Crushing: Using a classified crusher to reduce the black mud to a particle size of 14 μm or less, equivalent to 1000 mesh or finer.

　　3. Sterilization: Sterilize the dried black mud powder using radiation methods to meet cosmetic hygiene standards.

　　IV. Quality Characteristics

　　1. Sensory Characteristics: Uniform black-gray paste appearance with a naturally pleasant, delicate fragrance.

　　2. Physicochemical Indicators:

　　Item

　　 Physicochemical Indicators

　　Chloride Content (as NaCl), %

　　 ≥ 3.0

　　Solids Content

　　 ≥ 55

　　pH Value (at 25°C)

　　 (1:10 suspension) 6.0–8.5

　　Fineness, Residue on 125 μm (120 mesh) Sieve, %

　　 ≤5

　　Stability

　　 Heat resistance

　　 (40±1)°C for 24 hours, with no noticeable difference after returning to room temperature compared to before the test

　　Cold resistance

　　 -5°C for 24 hours, with no noticeable difference after returning to room temperature compared to before the test

　　3. Safety and other quality and technical requirements: The product’s safety and other quality and technical requirements must comply with relevant national regulations.