黒川温泉観光旅館協同組合補助泉
Kurokawa Onsen Cooperative Auxiliary SpringOperated by · 黒川温泉観光旅館協同組合
- Color
- very faintly yellow
- Taste
- slightly salty
- Odor
- faint hydrogen sulfide
Sodium Bicarbonate spring
- Sodium Na⁺
- salt's cation — pairs with chloride to make the water salty.
- Bicarbonate HCO₃⁻
- "soda" — softens skin, leaves it smooth.
- Smooth skindry, rough skin
- Circulationtired legs
- Aches & jointsstiff shoulders
A sodium-led bicarbonate spring with layered sulfate and chloride sub-types — the classic 'jūsō-sen' style. The wellhead runs at 80.8 °C, placing it among Japan's hottest natural sources, while the water itself stays neutral and hypotonic with moderate body. A generous 163.8 mg/kg of metasilicic acid lands it in the Japanese 'beauty-water' family, and the water carries a faint yellow tint at the source with a light salty tang and the unmistakable whisper of H₂S.
Sampled at wellhead·Analyzed Jun 21, 2019·株式会社 同仁グローカル·Cert no. 第K1811