渋温泉総合源泉（比良の湯、薬師の湯及びとんぼ村の湯の混合泉）
Shibu Onsen Combined Source (blend of Hira-no-yu, Yakushi-no-yu and Tonbomura-no-yu)Operated by · 渋温泉組惣代
Mixed source
硫
Sulfate
+ Chloride
- Color
- faintly yellow and clear
- Taste
- faintly metallic, iron-like
- Odor
- odorless
Sodium-Calcium Sulfate-Chloride spring
pH 4.6Weakly acidicHot source · 65°CHigh silica
Composition fingerprint1.2 g/kg dissolved · Hypotonic
Na⁺55
Ca²⁺34
SO₄²⁻53
Cl⁻45
◀ CationsAnions ▶
- Sodium Na⁺
- salt's cation — pairs with chloride to make the water salty.
- Sulfate SO₄²⁻
- "gypsum / Glauber's salt" — vessels and wound healing.
Known good for
- Aches & jointsstiff shoulders
- Circulationtired legs
- Warmingcold sensitivity
A sodium-calcium sulfate-chloride spring rising at a scalding 65 °C — among Japan's hotter natural sources. The sulfate base gives a settled, mineral-rich body with a salty edge, and at the wellhead the weakly acidic water carries a faint iron taste. With a generous 151 mg/kg of metasilicic acid, it leaves the kind of silica film that makes skin feel noticeably smoother afterwards, placing it in the beauty-water family.
Sampled at wellhead·Analyzed May 26, 2016·一般社団法人 上田薬剤師会 検査センター·Cert no. 中28-5（No.430）