甲斐大泉温泉
Kai-Oizumi OnsenOperated by · 北杜市
曹
Bicarbonate
+ Chloride · Sulfate
- Color
- faintly yellow-brown and slightly clear
- Taste
- weakly salty
- Odor
- metallic iron note
Sodium Bicarbonate spring
pH 7.5Weakly alkalineHot source · 53°CHigh silica
Composition fingerprint2.5 g/kg dissolved · Hypotonic
Na⁺86
HCO₃⁻75
SO₄²⁻15
◀ 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
- Circulationtired legs
- Aches & jointsstiff shoulders
A sodium-led bicarbonate spring — the classic jūsō-sen style — with chloride and sulfate nuances layered in, emerging hot at the source. Weakly alkaline and soft on the skin, it sits in the Japanese beauty-water family. At the wellhead the water carries a faint yellow-brown tint with a weak salty tang and a metallic iron note. A fair 88.4 mg/kg of metasilicic acid leaves the kind of silica film that makes skin feel smoother.
Sampled at wellhead·Analyzed Jan 30, 2012·株式会社 山梨県環境科学検査センター·Cert no. 山環温第23-25号
