黒川温泉
Kurokawa OnsenOperated by · いこい旅館
Sodium Chloride-Sulfate spring
- Sodium Na⁺
- salt's cation — pairs with chloride to make the water salty.
- Chloride Cl⁻
- table-salt anion — coats the skin and holds heat in.
- Aches & jointsstiff shoulders
- Smooth skindry, rough skin
- Recoveryfatigue, stress
A hot (72.5 °C) spring in the Kurokawa Onsen district, hypotonic and weakly acidic. With total dissolved solids of 682.7 mg/kg it falls into the simple-thermal classification — lightly mineralized rather than punchy. The standout figure is metasilicic acid at 169.8 mg/kg, well into the high-silica range, which leaves the kind of fine silica film that puts the water squarely in Japan's 'beauty-water' family.
Analyzed Jan 7, 2008·同仁グローカル株式会社