永石温泉
Nageshi OnsenOperated by · 別府市
湯
Simple
- Color
- colorless and clear
- Taste
- almost tasteless
- Odor
- almost odorless
Sodium-Magnesium Bicarbonate-Chloride spring
pH 8.0Weakly alkalineHot source · 47°CHigh silica
Composition fingerprint0.9 g/kg dissolved · Hypotonic
Na⁺54
Mg²⁺21
Ca²⁺19
HCO₃⁻49
Cl⁻38
SO₄²⁻13
◀ 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 spring with one striking number behind it: metasilicic acid at 196 mg/kg. Dissolved solids are light at 0.93 g/kg, so the water itself is undemanding, and its mild alkalinity makes it soft on the skin — the silica is what places it in Japan's beauty-water family, leaving the kind of thin film that has skin feeling noticeably smoother afterwards. Sodium leads the cations and bicarbonate the anions, though both sit at modest concentrations. The sample was drawn from the site's storage tank rather than the wellhead.
Sampled at mixing tank·Analyzed Feb 20, 2019·公益社団法人大分県薬剤師会·Cert no. 大薬検第7R-31020021号