薬研の湯
Yagen no YuOperated by · 十日町市
- Color
- colorless and clear
- Taste
- weakly sulfurous
- Odor
- very faint hydrogen sulfide
Sodium Chloride spring
- 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.
- Skin conditionsatopic skin, eczema
- Circulationtired legs
- Aches & jointsstiff shoulders
- Sensitive-skin cautionbroken or dry skin
Yagen no Yu is a simple sulfur spring — hypotonic, alkaline and hot at the wellhead. The water runs colorless and clear, yet carries a very faint rotten-egg note of H₂S and a weakly sulfurous taste, with 11.0 mg/kg of hydrosulfide ion behind it. At pH 9.0 it is solidly alkaline, and 55.5 mg/kg of metasilicic acid places it in Japan's beauty-water family — the slippery, skin-smoothing kind. Overall mineralization is light at 728 mg/kg, so the character comes from the sulfur rather than from body. The certificate's companion panel names it specifically for atopic dermatitis, psoriasis vulgaris, chronic eczema and pyoderma — the classic sulfur-spring indications.
Sampled at wellhead·Analyzed Oct 13, 2022·一般社団法人 県央研究所·Cert no. 県央温第D-331号