第2、4号源泉、山田源泉、大下源泉、東北源泉の混合泉
Asama Onsen Blended Spring (Nos. 2 & 4, Yamada, Oshita, Tohoku)Operated by · 浅間温泉事業協同組合
Mixed source
- Color
- almost colorless and clear
- Taste
- faintly sulfurous
- Odor
- faint hydrogen sulfide
Sodium-Calcium Sulfate spring
- Sodium Na⁺
- salt's cation — pairs with chloride to make the water salty.
- Sulfate SO₄²⁻
- "gypsum / Glauber's salt" — vessels and wound healing.
- Aches & jointsstiff shoulders
- Smooth skindry, rough skin
- Recoveryfatigue, stress
A blended source: five wells — Nos. 2 and 4 plus the Yamada, Oshita and Tohoku springs — are combined at Asama Onsen's central distribution tank, which is where the sample for this certificate was drawn. The water is an alkaline simple thermal spring at pH 9.0, soft on the skin with the slippery feel that places it in Japan's beauty-water family. Mineralization is light at 440 mg/kg, but 54 mg/kg of metasilicic acid leaves the kind of thin silica film that makes skin feel noticeably smoother afterwards. At the wellhead the water carries a faintly sulfurous taste and a light rotten-egg note of H₂S; the certificate's appendix lists it as documented for autonomic nervous system instability, depressed mood and insomnia.
Sampled at mixing tank·Analyzed Mar 25, 2026·一般社団法人 長野県薬剤師会·Cert no. 中No.7-45号