一丁目温泉
Itchome OnsenOperated by · ホテルアーサー株式会社
曹
Bicarbonate
- Color
- colorless and clear
- Taste
- faintly metallic, iron-like
- Odor
- almost odorless
Sodium-Magnesium Bicarbonate spring
pH 7.2NeutralHot source · 55°CHigh silica
Composition fingerprint1.3 g/kg dissolved · Hypotonic
Na⁺57
Mg²⁺20
Ca²⁺15
HCO₃⁻74
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
- Aches & jointsstiff shoulders
- Recoveryfatigue, stress
A sodium-magnesium bicarbonate spring in the soda-water tradition — the cert pairs the modern bicarbonate classification with the older 'earth-bearing soda spring' (gansa-rui jūsō-sen) name. Neutral pH and soft on the skin, it sits within Japan's classic beauty-water family. A generous 178 mg/kg of metasilicic acid leaves the kind of fine silica film that makes skin feel noticeably smoother afterwards.
Sampled at wellhead·Analyzed Apr 4, 2023·大分県薬剤師会検査センター·Cert no. 大薬検 第7R-23040002号