藤七温泉
Toshichi OnsenOperated by · 株式会社だんぶり
黄
Sulfur
- Color
- white, slightly turbid
- Taste
- not recorded
- Odor
- hydrogen sulfide
Calcium Sulfate spring
pH 3.7Weakly acidicHot source · 87°CSulfur-rich
Composition fingerprint0.2 g/kg dissolved · Hypotonic
Ca²⁺32
Mg²⁺18
H⁺15
SO₄²⁻96
◀ CationsAnions ▶
- Calcium Ca²⁺
- settling and calming; can leave a white mineral bloom.
- 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
A simple sulfur spring of the hydrogen sulfide subtype, welling up at 87 °C from one of Japan's hottest natural sources high in the Hachimantai mountains. At the source the water is milky-white and faintly turbid, carrying the unmistakable rotten-egg note of H₂S. It runs weakly acidic at pH 3.7, with lightly mineralized chemistry (177 mg/kg dissolved solids) but a clear sulfur signature — free H₂S at 4.12 mg/kg and free CO₂ at 52.9 mg/kg. Classified under the older name 'tanjun ryūkasuiso-sen' (simple hydrogen sulfide spring), it's the kind of high-mountain sulfur water that needs no dilution or reheating to bathe in.
Analyzed Aug 23, 2016·公益財団法人 秋田県総合保健事業団 児桜検査センター·Cert no. No.28-07-77-003
