由布岳温泉
Yufudake Onsen湯
Simple
- Color
- colorless and clear
- Taste
- tasteless
- Odor
- odorless
Sodium Bicarbonate-Chloride spring
pH 7.9Weakly alkalineHot source · 42°CHigh silica
Composition fingerprint0.3 g/kg dissolved · Hypotonic
Na⁺91
HCO₃⁻61
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
- Aches & jointsstiff shoulders
- Smooth skindry, rough skin
- Recoveryfatigue, stress
A gentle simple thermal spring rising in the Kawakami district of Yufuin, Yufu City. Weakly alkaline and lightly mineralized at just 0.34 g/kg of dissolved solids, the water is colorless, clear, tasteless and odorless — about as unintrusive as onsen water gets. What lifts it is the silica: metasilicic acid at 188.0 mg/kg is generous enough to place this water in Japan's beauty-water family, leaving the thin mineral film that makes skin feel noticeably smoother afterwards.
Sampled at wellhead·Analyzed Dec 12, 2019·公益社団法人大分県薬剤師会 検査センター·Cert no. 大薬検 第7R-19120008号
