総合湯
Sōgō-yu (Ikaho Onsen blended source)Operated by · 伊香保グランドホテル併設 黄金の湯館
Mixed source
- Color
- colorless and transparent, with a few brown floating particles
- Taste
- not recorded
- Odor
- not recorded
Calcium-Sodium Sulfate-Bicarbonate-Chloride spring
- Calcium Ca²⁺
- settling and calming; can leave a white mineral bloom.
- Sulfate SO₄²⁻
- "gypsum / Glauber's salt" — vessels and wound healing.
- Aches & jointsstiff shoulders
- Circulationtired legs
- Warmingcold sensitivity
A blended source — Ikaho Onsen's communal Sōgō-yu pool of wells — led by calcium and sodium with sulfate as the dominant anion, layered with bicarbonate softness and a salty chloride edge. Neutral and hypotonic, moderately mineralized at about 1.2 g/kg, it sits gently on the skin; the water is colorless and clear but carries a few brown flecks, the visible trace of its dissolved iron. A generous 181 mg/kg of metasilicic acid puts it squarely in Japan's beauty-water family, leaving the kind of silica film that makes skin feel noticeably smoother afterwards. The posted certificate lists cuts, burns, chronic skin conditions and cold sensitivity among its documented indications.
Analyzed May 30, 2017·群馬県薬剤師会環境衛生試験センター