黒川温泉(のし湯)
Kurokawa Onsen (Noshiyu)Operated by · お宿 のし湯
曹
Bicarbonate
+ Sulfate · Chloride
- Color
- nearly 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 hot 75.8 °C sodium-bicarbonate spring with sulfate and chloride layered in, sitting at neutral pH 6.7 — well above 65 °C, among Japan's hotter natural sources. A faint hydrogen sulfide note hangs over the bath. With 303.8 mg/kg of metasilicic acid, the water leaves a thin silica film that makes skin feel noticeably smoother afterwards.
Analyzed Sep 16, 2022·株式会社九州テクノス·Cert no. 熊本県阿蘇保健所登録第3号