黒川温泉（のし湯）
Kurokawa Onsen (Noshiyu)Operated by · お宿 のし湯
曹
Bicarbonate
+ Sulfate · Chloride
- Color
- almost colorless and clear
- Taste
- tasteless
- Odor
- faint hydrogen sulfide
Sodium Bicarbonate-Sulfate-Chloride spring
Hot source · 76°CHigh silica
Composition fingerprint2.0 g/kg dissolved · Hypotonic
Na⁺61
Mg²⁺16
Ca²⁺13
HCO₃⁻40
SO₄²⁻33
Cl⁻27
◀ 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-led bicarbonate spring layered with sulfate and chloride — the jūsō-sen style, soft on the skin and squarely in Japan's beauty-water family. Moderately mineralized at 1,956 mg/kg and neutral in pH, the water is almost colorless and clear, carrying a faint note of hydrogen sulfide at the source. A generous 303.8 mg/kg of metasilicic acid leaves the kind of silica film that makes skin feel noticeably smoother afterwards, and the wellhead itself ranks among Japan's hottest natural sources.
Analyzed Sep 16, 2022