Tanokura Onsen
Analysis VerifiedGently bubbling forth in the Yufuin basin at the foot of the famed Mount Yufu, Tanokura Onsen is one of the area's many distinctive springs. This region has long been cherished as a therapeutic hot spring destination. This specific source is characterized by its silky-smooth texture, a gift of its weak alkalinity with a pH of 8.4. The water gently envelops the skin, leaving it feeling deeply moisturized after bathing. It is a tranquil spring that offers solace to those wishing to escape the hustle and bustle and unwind in a serene, natural setting.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
A trace component with gentle antibacterial and anti-inflammatory action.
Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.
▸Note
The temperature, pH and component values shown here are based on the hot spring analysis (source). Actual values in the bath may differ depending on heating, dilution, recycling and filtration. Please check current usage status at the facility.
The source is a hot 51.2°C, but it is adjusted to a comfortable temperature in the bath. With a gentle pH of 8.4, the water is mild on the skin, making it ideal for a long, relaxing soak. Enjoy the smooth sensation from the rich metasilicic acid to release both mental and physical tension.
The main appeal of this spring is its pH of 8.4 and a high content of 170.0 mg/kg of metasilicic acid, a known skin-beautifying component. It's expected to deliver silky skin by gently removing old skin cells and retaining moisture. This is the perfect balneotherapy experience for those seeking deep relaxation and happy skin in Yufuin's tranquil nature.
As a simple hot spring, the water is mild and suitable for most people. However, those with general contraindications for bathing (e.g., acute illness, severe heart disease, active tuberculosis) should refrain.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Tanokura Onsen
- Spring type
- Simple Hot Spring
- Old spring type name
- 単純温泉
- Source temperature
- 51.2℃
- pH
- 8.4
- Flow type
- 動力揚湯
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2024-10-11
- Analyst organization
- 公益社団法人大分県薬剤師会
- Registration No.
- 大分県第3号
Cations
- Lithium ion Li⁺
- 0.20 mg/kg
- Sodium ion Na⁺
- 105 mg/kg
- Potassium ion K⁺
- 10.6 mg/kg
- Magnesium ion Mg²⁺
- 4.2 mg/kg
- Calcium ion Ca²⁺
- 8.3 mg/kg
- Manganese ion Mn²⁺
- 0.20 mg/kg
- Total cations
- 0.13 mg/kg
Anions
- Fluoride ion F⁻
- 0.20 mg/kg
- Chloride ion Cl⁻
- 60.3 mg/kg
- Sulfate ion SO₄²⁻
- 49.9 mg/kg
- Bicarbonate ion HCO₃⁻
- 165 mg/kg
- Carbonate ion CO₃²⁻
- 9.0 mg/kg
- Bromide ion Br⁻
- 0.20 mg/kg
- Total anions
- 0.28 mg/kg
Undissociated Components
- Sulfuric acid H₂SO₄
- 0.00 mg/kg
- Phosphoric acid H₃PO₄
- 0.00 mg/kg
- Arsenious acid HAsO₂
- 0.20 mg/kg
- Metasilicic acid H₂SiO₃
- 170 mg/kg
- Metaboric acid HBO₂
- 2.9 mg/kg
- Total undissociated
- 0.17 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 0.00 mg/kg
- Free hydrogen sulfide H₂S
- 0.00 mg/kg
- Total dissolved gas
- 0.00 mg/kg
Totals
- Total dissolved substances
- 0.59 mg/kg
- Component total
- 0.59 mg/kg
- Evaporation residue
- 0.49 mg/kg
Usage
- Heating
- No
- Dilution
- No
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- No
Indications & Contraindications
- Bathing indications
- Autonomic instability, Insomnia, Depression
- General indications
- High blood pressure (mild), Rheumatoid arthritis, Chronic pain or stiffness in muscles and joints, Muscle stiffness due to motor paralysis, Gastrointestinal dysfunction
- Contraindications
- Acute illness (especially with fever), Active tuberculosis, Malignant tumors, Severe heart disease, Respiratory failure, Renal failure, Bleeding disorders, Severe anemia, Any actively progressing illness, Pregnancy (especially early and late stages)
Drinking
- Drinkability
- Not drinkable
