中の湯(旧本館泉)
Nakanoyu (Former Main Building Spring)Operated by · 中の湯温泉旅館
- Color
- colorless and clear
- Taste
- not recorded
- Odor
- faint hydrogen sulfide
Sodium-Calcium Bicarbonate-Chloride spring
- Sodium Na⁺
- salt's cation — pairs with chloride to make the water salty.
- Bicarbonate HCO₃⁻
- "soda" — softens skin, leaves it smooth.
- Skin conditionsatopic skin, eczema
- Circulationtired legs
- Aches & jointsstiff shoulders
- Sensitive-skin cautionbroken or dry skin
A simple sulfur spring of the hydrogen-sulfide type — colorless and clear in the cup, yet carrying the unmistakable faint rotten-egg note of H₂S, with free hydrogen sulfide, hydrosulfide and thiosulfate all present in the water. Dissolved solids come to just 536 mg/kg, so the water is lightly mineralized and gentle on the body, and the pH sits essentially neutral at the wellhead. What stands out chemically is metasilicic acid at 147.3 mg/kg — enough silica to leave the thin film that makes skin feel noticeably smoother afterwards.
Sampled at wellhead·Analyzed Aug 5, 2024·環境未来株式会社 総合検査センター·Cert no. KM2400024188-A1-001