横湯第一ボーリング、横湯第二ボーリング、熱の湯の混合泉
Yokoyu No.1 Boring, Yokoyu No.2 Boring & Netsu-no-yu Mixed SpringMixed source
塩
Chloride
+ Sulfate
- Color
- almost colorless and transparent
- Taste
- slightly salty with a faint sulfur note
- Odor
- not recorded
Sodium-Calcium Chloride-Sulfate spring
pH 8.0Weakly alkalineHot source · 87°CHigh silica
Composition fingerprint1.6 g/kg dissolved · Hypotonic
Na⁺69
Ca²⁺26
Cl⁻60
SO₄²⁻36
◀ 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
- Circulationtired legs
- Aches & jointsstiff shoulders
A sodium-calcium chloride-sulfate spring blended from three Yokoyu wells. Weakly alkaline and soft on the skin, the water is almost colorless and transparent yet carries a faint salty, sulfurous edge. The source emerges scaldingly hot at 86.5 °C, among Japan's hottest, and its 199 mg/kg of metasilicic acid leaves a thin silica film for noticeably smoother skin.
Sampled at bath inlet·Analyzed May 26, 2016·一般社団法人 上田薬剤師会 検査センター·Cert no. No.427