湯の峰温泉 平成1号・平成4号混合泉
Yu-no-mine Onsen Heisei #1 / Heisei #4 Mixed SpringOperated by · 田辺市四村川財産区
Mixed source
曹
Bicarbonate
+ Chloride
- Color
- Colorless and clear
- Taste
- Tasteless
- Odor
- Odorless
Sodium Bicarbonate-Chloride spring
pH 7.9Weakly alkalineHot source · 75°CHigh silica
Composition fingerprint1.7 g/kg dissolved · Hypotonic
Na⁺90
HCO₃⁻67
Cl⁻28
◀ CationsAnions ▶
- Sodium Na⁺
- salt's cation — pairs with chloride to make the water salty.
- Bicarbonate HCO₃⁻
- "soda" — softens skin, leaves it smooth.
Known good for
- Smooth skindry, rough skin
- Aches & jointsstiff shoulders
- Warmingcold sensitivity
A sodium-led bicarbonate spring with a chloride layer — the classic 'jūsō-sen' style softened by a salty edge, delivered as a blend of two wells (Heisei #1 and Heisei #4) through a common mixing tank. The wellhead temperature of 74.5 °C puts it among Japan's hottest natural sources, and the weakly alkaline pH gives it the slippery, soft-on-skin feel of the Japanese 'beauty-water' family. A generous 153 mg/kg of metasilicic acid leaves the kind of thin silica film that makes skin feel noticeably smoother afterwards.
Sampled at mixing tank·Analyzed Feb 10, 2022·一般社団法人 和歌山県薬剤師会 医薬品・公衆衛生検査センター·Cert no. 第E2202104号