法性の湯
Hosshō-no-yu SpringOperated by · 株式会社聚楽 万座ホテル聚楽
- Color
- colorless and transparent
- Taste
- not recorded
- Odor
- hydrogen sulfide present
Calcium Sulfate spring
- Calcium Ca²⁺
- settling and calming; can leave a white mineral bloom.
- Sulfate SO₄²⁻
- "gypsum / Glauber's salt" — vessels and wound healing.
- Skin conditionsatopic skin, eczema
- Circulationtired legs
- Smooth skindry, rough skin
- Sensitive-skin cautionbroken or dry skin
Hosshō-no-yu at Manza is a simple sulfur spring of the hydrogen sulfide type, carrying an unusually heavy 286 mg/kg of free H₂S — the water is colorless and clear, but the unmistakable rotten-egg note comes off it immediately. At pH 3.1 it is weakly acidic and faintly tangy on the skin, and the dissolved solids are light at 0.64 g/kg, so the character of this water comes from its gases rather than its salts. A generous 75.7 mg/kg of metasilicic acid still leaves the kind of thin silica film that makes skin feel noticeably smoother afterwards. The sample was drawn at the inflow pipe of the aeration tank rather than at the wellhead itself.
Sampled at delivery pipe·Analyzed Jun 6, 2018·一般社団法人 群馬県薬剤師会(環境衛生試験センター)
