雲仙温泉(八幡地獄)
Unzen Onsen (Hachiman Jigoku)Operated by · 雲仙スカイホテル
酸
Acidic
+ Iron-bearing · Sulfate
- Color
- milky white with a faint yellow tint
- Taste
- faintly sour
- Odor
- faint hydrogen sulfide
Aluminum-Hydrogen Sulfate spring
High silicaSulfur-rich
Composition fingerprint1.1 g/kg dissolved · Hypotonic
Al³⁺34
H⁺28
SO₄²⁻93
◀ CationsAnions ▶
- Aluminum Al³⁺
- shows up in acidic volcanic water.
- Sulfate SO₄²⁻
- "gypsum / Glauber's salt" — vessels and wound healing.
Known good for
- Skin conditionsatopic skin, eczema
- Circulationtired legs
- Aches & jointsstiff shoulders
- Sensitive-skin cautionbroken or dry skin
An acidic iron-bearing sulfate spring rising at Unzen's Hachiman Jigoku. At pH 3.4 the water is faintly sour and milky-white with a pale yellow cast, carrying the characteristic rotten-egg note of H₂S. Sulfate dominates the dissolved load, and a generous 184 mg/kg of metasilicic acid leaves a thin silica film that makes skin feel smoother afterwards.
Sampled at wellhead·Analyzed Sep 14, 2004·西部環境調査株式会社·Cert no. 第8472-1号・第8472-2号