トビ温泉
Tobi Onsen黄
Sulfur
- Color
- colorless and transparent
- Taste
- tasteless
- Odor
- strong hydrogen sulfide
Calcium-Magnesium-Sodium Sulfate-Bicarbonate spring
pH 5.3Weakly acidicHot source · 64°CSulfur-richHigh silica
Composition fingerprint0.1 g/kg dissolved · Hypotonic
Ca²⁺42
Mg²⁺29
Na⁺25
SO₄²⁻55
HCO₃⁻34
◀ CationsAnions ▶
- Calcium Ca²⁺
- settling and calming; can leave a white mineral bloom.
- Sulfate SO₄²⁻
- "gypsum / Glauber's salt" — vessels and wound healing.
Known good for
- Skin conditionsatopic skin, eczema
- Circulationtired legs
- Aches & jointsstiff shoulders
- Sensitive-skin cautionbroken or dry skin
A simple sulfur spring of the hydrogen-sulfide type. The water runs colorless and clear at the wellhead, yet the certificate records a strong rotten-egg note — 45.7 mg/kg of free H₂S stands behind it. Total dissolved solids reach only 148 mg/kg, so the water is lightly mineralized and weakly acidic, faintly tangy rather than aggressive on the skin. Metasilicic acid at 64.5 mg/kg places it in Japan's beauty-water family, leaving the kind of thin silica film that makes skin feel smoother afterwards.
Sampled at wellhead·Analyzed Nov 25, 2019·株式会社 東洋環境分析センター·Cert no. yZ1904615-001
