松亀の湯
Matsuki no Yu Spring塩
Chloride
- Color
- colorless and clear
- Taste
- very faintly salty
- Odor
- odorless
Sodium Chloride spring
pH 7.4Weakly alkalineHot source · 47°CHigh silica
Composition fingerprint3.3 g/kg dissolved · Hypotonic
Na⁺78
Cl⁻79
HCO₃⁻17
◀ CationsAnions ▶
- Sodium Na⁺
- salt's cation — pairs with chloride to make the water salty.
- Chloride Cl⁻
- table-salt anion — coats the skin and holds heat in.
Known good for
- Warmingcold sensitivity
- Aches & jointsstiff shoulders
- Smooth skindry, rough skin
Matsuki no Yu rises in the Kitahama district of Beppu as a sodium chloride spring — jun-shokuen-sen under the older naming. Hypotonic and mildly alkaline, it runs colorless and clear at the wellhead with only the faintest salty tang on the lips, and the chloride load gives it the heat-retaining quality the type is known for. A generous 180.3 mg/kg of metasilicic acid puts it squarely in Japan's beauty-water family, leaving the kind of thin silica film that makes skin feel noticeably smoother afterwards.
Sampled at wellhead·Analyzed Jun 21, 2005·株式会社住化分析センター 大分事業所·Cert no. 4552192-0-1