岩文乃湯・明治湯混合泉
Iwabun-no-yu & Meiji-yu Mixed SpringOperated by · 岩文の湯組合
Mixed source
塩
Chloride
+ Sulfate
- Color
- colorless and transparent
- Taste
- not recorded
- Odor
- not recorded
Sodium-Calcium Chloride-Sulfate spring
pH 6.6NeutralHot source · 51°CHigh silica
Composition fingerprint1.6 g/kg dissolved · Hypotonic
Na⁺57
Ca²⁺38
Cl⁻56
SO₄²⁻41
◀ 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 blend of two naturally emerging Shima Onsen wells — Iwabun-no-yu and Meiji-yu — sampled from the storage tank where they come together. Sodium and calcium lead a chloride water with sulfate layered in for quiet body: neutral pH, moderately mineralized at about 1.6 g/kg, salty enough to hold its heat well. Metasilicic acid at 106 mg/kg puts it in Japan's beauty-water family, leaving the thin silica film that makes skin feel noticeably smoother afterwards.
Sampled at mixing tank·Analyzed Dec 18, 2014·一般社団法人 群馬県薬剤師会（環境衛生試験センター）