彩光の湯
Saikō-no-Yu SpringOperated by · 中村睦子
曹
Bicarbonate
+ Sulfate
- Color
- colorless and transparent
- Taste
- very faint metallic taste
- Odor
- faint sulfur
Sodium Bicarbonate-Sulfate spring
pH 6.8NeutralHot source · 56°CHigh silica
Composition fingerprint1.3 g/kg dissolved · Hypotonic
Na⁺73
Ca²⁺17
HCO₃⁻62
SO₄²⁻21
Cl⁻17
◀ 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 with sulfate quietly filling out the body — the classic jūsō-sen style emerging hot at 56 degrees Celsius. At the wellhead it carries a faint sulfur note and a slight metallic edge on the tongue, while a neutral pH keeps the touch soft and places it in Japan's beauty-water family. A generous 168.8 mg/kg of metasilicic acid leaves the kind of silica film that makes skin feel noticeably smoother afterwards.
Sampled at wellhead·Analyzed Oct 28, 2011·宮崎県衛生環境研究所·Cert no. 宮衛環研温第301号