一丁目温泉
Itchome OnsenOperated by · ホテルアーサー株式会社
Sampled at wellhead
曹
Bicarbonate
Classification
Sodium-Magnesium Bicarbonate spring
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.
pH
7.20
Neutral
Source temperature
55.1°C
Hot
Tonicity
1.25g/kg
Hypotonic
Free CO₂
36mg/kg
Low
- Color
- colorless and clear
- Taste
- faintly metallic, iron-like
- Odor
- almost odorless
Highlights
- High silica
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