奥の湯
Okunoyu SpringOperated by · 黒川温泉 旅館 奥の湯
- Color
- nearly colorless and clear
- Taste
- faint metallic taste
- Odor
- hydrogen sulfide odor
Sodium Sulfate-Chloride spring
- Sodium Na⁺
- salt's cation — pairs with chloride to make the water salty.
- Sulfate SO₄²⁻
- "gypsum / Glauber's salt" — vessels and wound healing.
- Aches & jointsstiff shoulders
- Smooth skindry, rough skin
- Recoveryfatigue, stress
A gentle simple thermal spring in the hypotonic, neutral, high-temperature class, emerging at 73.1 °C — among Japan's hotter natural sources. Lightly mineralized and easy on the body, it is nonetheless rich in metasilicic acid, placing it in Japan's beauty-water family: the silica leaves a thin moisturizing film that makes skin feel smoother. The water is nearly colorless and clear, carrying a faint note of hydrogen sulfide and a whisper of metallic taste from its trace iron — real character for a spring classified as simple.
Analyzed Dec 6, 2022