松泉乃湯
Shōsen-no-yu Spring湯
Simple
Sodium Bicarbonate spring
Top-decile alkaline
Composition fingerprint
Na⁺98
HCO₃⁻71
◀ 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
- Recoveryfatigue, stress
Shōsen-no-yu is an alkaline simple thermal spring with a pH of 9.42 — high enough to give the slippery, skin-softening feel that places it squarely in the Japanese 'beauty-water' family. Mineralization is light: sodium leads the cation side and bicarbonate accounts for about 70% of the anions, so the water reads as gentle and unobtrusive on the body rather than heavy or salty. Classified as hypotonic, alkaline, low-temperature water in Kyoto's Jōyō City, with the usual general indications — neuralgia, muscle and joint pain, stiff shoulder, poor circulation, fatigue recovery — printed on the summary poster.
Sampled at wellhead
