伊豆長岡温泉(混合泉)
Izu-Nagaoka Onsen (Mixed Source)Operated by · 伊豆長岡温泉事業協同組合
Mixed source
湯
Simple
- Color
- colorless and clear
- Taste
- tasteless
- Odor
- odorless
Sodium Chloride-Sulfate spring
pH 9.3AlkalineHot source · 63°CHigh silicaTop-decile alkaline
Composition fingerprint0.6 g/kg dissolved · Hypotonic
Na⁺87
Cl⁻45
SO₄²⁻43
◀ 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
- Aches & jointsstiff shoulders
- Smooth skindry, rough skin
- Recoveryfatigue, stress
A blended source of Izu-Nagaoka Onsen, classified as a hot (62.5 °C) alkaline simple thermal spring. With pH 9.3 the water gives the slippery, soft-on-the-skin feel of the Japanese 'beauty-water' family, even though total mineralization sits at a modest 0.631 g/kg. The standout is metasilicic acid at 65 mg/kg — a generous reading that leaves the kind of silica film bathers feel as noticeably smoother skin afterwards.
Sampled at mixing tank·Analyzed Aug 15, 2024·一般財団法人 静岡県生活科学検査センター
