嬉野温泉
Ureshino OnsenOperated by · 嬉野市
曹
Bicarbonate
+ Chloride
- Color
- colorless and transparent
- Taste
- slightly salty
- Odor
- odorless
Sodium Bicarbonate-Chloride spring
pH 7.7Weakly alkalineHot source · 81°CHigh silica
Composition fingerprint1.8 g/kg dissolved · Hypotonic
Na⁺94
HCO₃⁻66
Cl⁻28
◀ 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
- Aches & jointsstiff shoulders
- Warmingcold sensitivity
A weakly alkaline sodium bicarbonate-chloride spring rising at a striking 81 °C — one of Japan's hottest natural sources at this site. The bicarbonate-dominant chemistry, classified as the legacy jūsō-sen (soda-water) style, gives the slippery feel Ureshino is famous for as one of the country's three great beauty-water onsens, while the chloride layer adds heat-retaining body. Metasilicic acid at 135.6 mg/kg leaves a faintly hydrating silica film, and the wellhead reads only mildly salty.
Sampled at wellhead·Analyzed Mar 23, 2023·一般社団法人 佐賀県環境科学検査協会·Cert no. 2022-00028-01号