けいはんな学研天然温泉
Keihanna Gakken Natural Hot SpringOperated by · 株式会社弘商会
湯
Simple
- Color
- Colorless and clear
- Taste
- Nearly tasteless
- Odor
- Odorless
Sodium Bicarbonate spring
pH 8.1Weakly alkalineHigh silicaHigh radon
Composition fingerprint0.8 g/kg dissolved · Hypotonic
Na⁺92
HCO₃⁻95
◀ 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
- Aches & jointsstiff shoulders
- Smooth skindry, rough skin
- Recoveryfatigue, stress
A simple thermal source ('Keihanna Gakken Tennen Onsen') with light overall mineralization — 0.83 g/kg dissolved solids — yet weakly alkaline and soft on the skin, sitting squarely in the Japanese 'beauty-water' family. Generous metasilicic acid (86.6 mg/kg) leaves a thin silica film that smooths the skin, and an unusually high radon content of 90.9 Bq/kg places it in the 'hormesis' radon tradition — a rare pairing in a single-named simple spring.
Sampled at wellhead·Analyzed Aug 18, 2020·公益財団法人 中央温泉研究所·Cert no. 甲第3768号
