Tama no Yu No.1
Analysis UnverifiedTapped deep beneath the Yufuin basin, this 55°C spring is mild in total minerals yet alkaline and rich in metasilicic acid, wrapping the skin in a soft, silky touch. Clear, odorless and understated, it suits the quiet woods and mountain views of Yufuin.
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.
At pH 8.6 the water gently lifts oils, so go light on soap and enjoy its smoothness. The 55°C source can make the inlet hot; moisturize afterward to keep the silky feel.
Alkaline at pH 8.6 with 214.0 mg/kg of metasilicic acid, the water softens the skin for a silky skin finish, while its gentle, hypotonic character invites deep relaxation without strain on the body.
The 55°C source can be hot near the inlet. Avoid bathing when unwell or after drinking alcohol, keep soaks short, and stay hydrated.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Tama no Yu No.1
- Spring type
- Alkaline Simple Hot Spring
- Old spring type name
- 単純温泉
- Source temperature
- 55℃
- pH
- 8.6
- Flow type
- 動力揚湯
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2019-12-03
- Analyst organization
- 公益社団法人大分県薬剤師会（大分県薬剤師会検査センター）
- Registration No.
- 大分県第3号
Cations
- Lithium ion Li⁺
- 0.30 mg/kg
- Sodium ion Na⁺
- 123 mg/kg
- Potassium ion K⁺
- 20.9 mg/kg
- Magnesium ion Mg²⁺
- 4.7 mg/kg
- Calcium ion Ca²⁺
- 8.9 mg/kg
- Manganese ion Mn²⁺
- 0.50 mg/kg
- Lead ion Pb²⁺
- < 0.01 mg/kg
- Barium ion Ba²⁺
- 0.10 mg/kg
- Copper ion Cu²⁺
- < 0.05 mg/kg
- Cadmium ion Cd²⁺
- < 0.001 mg/kg
- Total cations
- 0.16 mg/kg
Anions
- Fluoride ion F⁻
- 0.30 mg/kg
- Chloride ion Cl⁻
- 83.1 mg/kg
- Sulfate ion SO₄²⁻
- 59.1 mg/kg
- Bicarbonate ion HCO₃⁻
- 120 mg/kg
- Carbonate ion CO₃²⁻
- 34.8 mg/kg
- Bromide ion Br⁻
- 0.20 mg/kg
- Hydrogen phosphate HPO₄²⁻
- 0.30 mg/kg
- Total anions
- 0.30 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
- 214 mg/kg
- Metaboric acid HBO₂
- 3.9 mg/kg
- Total undissociated
- 0.22 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
Trace Components
- Radon Rn
- < 7.4 Bq/kg
Totals
- Total dissolved substances
- 0.67 mg/kg
- Component total
- 0.67 mg/kg
- Evaporation residue
- 0.57 mg/kg
Usage
- Usage status
- Unknown
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
