万座温泉 6源泉混合泉
Manza Onsen Six-Source BlendOperated by · 株式会社プリンスホテル 万座・嬬恋地区
Mixed source
- Color
- yellow, with yellow suspended matter
- Taste
- not recorded
- Odor
- hydrogen sulfide
Hydrogen-Sodium-Magnesium Sulfate-Chloride spring
- Hydrogen H⁺
- makes the water acidic — sharp and bactericidal.
- Sulfate SO₄²⁻
- "gypsum / Glauber's salt" — vessels and wound healing.
- Skin conditionsatopic skin, eczema
- Circulationtired legs
- Aches & jointsstiff shoulders
- Sensitive-skin cautionbroken or dry skin
Six of Manza's wells feed a mixing tank on the hotel grounds, and this certificate reads that blend: the Ubayu (yubatake) spring, three Oonigayu wells, Ryusen-no-yu and the Karaana source also known as Tsumatori-no-yu, all of them free-flowing. The result is an acidic, sulfur-bearing water at pH 2.1, sharp enough to prickle on contact, yellow at the outlet with yellow floc drifting in it and an unmistakable rotten-egg note of H₂S. Metasilicic acid runs to 205 mg/kg, laying a little silica smoothness over the acidic bite. The hotel's own onsen map documents the water for neuralgia, muscle and joint pain, cold sensitivity and fatigue recovery, and a companion panel explains that sulfur springs dissolve surface keratin while widening the capillaries.
Sampled at mixing tank·Analyzed Aug 18, 2017·一般社団法人 群馬県薬剤師会(環境衛生試験センター)