黒川温泉
Kurokawa OnsenOperated by · 黒川温泉 旅館 こうの湯
曹
Bicarbonate
+ Sulfate · Chloride
- Color
- faintly yellow and clear
- Taste
- moderately astringent
- Odor
- faint hydrogen sulfide
Sodium-Calcium Bicarbonate-Sulfate-Chloride spring
pH 6.4NeutralHot source · 61°CHigh silica
Composition fingerprint1.2 g/kg dissolved · Hypotonic
Na⁺53
Ca²⁺20
Mg²⁺17
HCO₃⁻37
SO₄²⁻32
Cl⁻31
◀ CationsAnions ▶
- Sodium Na⁺
- salt's cation — pairs with chloride to make the water salty.
- Bicarbonate HCO₃⁻
- "soda" — softens skin, leaves it smooth.
Known good for
- Smooth skindry, rough skin
- Circulationtired legs
- Aches & jointsstiff shoulders
A sodium-calcium spring blending bicarbonate, sulfate, and chloride character, emerging hot at 60.5 C with neutral pH. Metasilicic acid is unusually generous at 261 mg/kg, leaving a thin silica film that smooths the skin afterwards. The water carries a faint yellow tint, a moderate astringent edge on the tongue, and the unmistakable whiff of hydrogen sulfide typical of Kurokawa Onsen.
Sampled at wellhead·Analyzed Nov 29, 2016·株式会社 同仁グローカル·Cert no. 第K16105632号
