Taradake Onsen (Provisional Name)
Analysis UnverifiedAnalyzed in 2020, this is a relatively new spring on the shore of Tara, where the slopes of Mount Tara run down to the Ariake Sea. It emerges as a cool 22.8°C mineral spring; bicarbonate makes up about 80 percent of the anions, while magnesium, calcium and sodium share the cations almost evenly. At just 0.18 g/kg it is soft, almost like fresh water, yet 69.5 mg/kg of metasilicic acid gives it its character as an onsen, a quiet water to sink into while watching the great tides of the Ariake Sea.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
Transdermal absorption gently supports skin hydration and muscle relaxation.
- Metasilicic acid69.5 mg/kg
- Feel
- Your skin may feel smoother.
- Said to
- 50 mg/kg or more is said to mark a “skin-beautifying spring”; it is also used in skincare.
- Note
- The “skin-beautifying” label is a common rule of thumb, not a legal standard.
Effects are general descriptions based on the Ministry of the Environment’s indications by spring type, not a guarantee.
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 22.8°C source is heated for bathing. Mild at pH 8.4 and very dilute, it suits a long, easy soak; try a half-body bath while enjoying the sea view.
Its pH 8.4 alkalinity, 74.5 mg/kg of bicarbonate and 69.5 mg/kg of metasilicic acid may leave skin feeling smooth and silky, and the gentle, dilute water invites deep relaxation by the sea.
This water does not meet therapeutic-spring criteria, so do not expect specific effects. It is heated and recirculated for bathing; avoid overly long soaks and drink water before and after.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Taradake Onsen (Provisional Name)
- Spring type
- Cold Mineral Spring
- Source temperature
- 22.8℃
- pH
- 8.4
- Flow type
- 動力揚湯
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2020-10-13
- Analyst organization
- 株式会社CRC食品環境衛生研究所
- Registration No.
- 福岡県第6号
Cations
- Hydrogen ion H⁺
- 0.00 mg/kg
- Lithium ion Li⁺
- 0.00 mg/kg
- Sodium ion Na⁺
- 8.6 mg/kg
- Potassium ion K⁺
- 2.0 mg/kg
- Ammonium ion NH₄⁺
- 0.00 mg/kg
- Magnesium ion Mg²⁺
- 6.1 mg/kg
- Calcium ion Ca²⁺
- 8.6 mg/kg
- Aluminum ion Al³⁺
- 0.00 mg/kg
- Manganese ion Mn²⁺
- 0.00 mg/kg
- Iron(II) ion Fe²⁺
- 0.00 mg/kg
- Lead ion Pb²⁺
- < 0.01 mg/kg
- Strontium ion Sr²⁺
- 0.00 mg/kg
- Barium ion Ba²⁺
- 0.00 mg/kg
- Copper ion Cu²⁺
- < 0.01 mg/kg
- Total cations
- 25.2 mg/kg
Anions
- Fluoride ion F⁻
- 0.00 mg/kg
- Chloride ion Cl⁻
- 3.0 mg/kg
- Hydroxide ion OH⁻
- 0.00 mg/kg
- Hydrogen sulfide ion HS⁻
- 0.00 mg/kg
- Thiosulfate ion S₂O₃²⁻
- 0.00 mg/kg
- Sulfate ion SO₄²⁻
- 1.1 mg/kg
- Bicarbonate ion HCO₃⁻
- 74.5 mg/kg
- Carbonate ion CO₃²⁻
- 4.2 mg/kg
- Bromide ion Br⁻
- 0.00 mg/kg
- Iodide ion I⁻
- 0.00 mg/kg
- Hydrogen sulfate HSO₄⁻
- 0.00 mg/kg
- Nitrite ion NO₂⁻
- 0.00 mg/kg
- Nitrate ion NO₃⁻
- 1.1 mg/kg
- Dihydrogen phosphate H₂PO₄⁻
- 0.00 mg/kg
- Hydrogen phosphate HPO₄²⁻
- 0.00 mg/kg
- Arsenite ion AsO₂⁻
- 0.00 mg/kg
- Sulfide ion S²⁻
- 0.00 mg/kg
- Hydrogen metasilicate HSiO₃⁻
- 0.00 mg/kg
- Metaborate ion BO₂⁻
- 0.00 mg/kg
- Total anions
- 83.9 mg/kg
Undissociated Components
- Arsenious acid HAsO₂
- 0.00 mg/kg
- Metasilicic acid H₂SiO₃
- 69.5 mg/kg
- Metaboric acid HBO₂
- 0.00 mg/kg
- Total undissociated
- 69.5 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 0.50 mg/kg
- Free hydrogen sulfide H₂S
- 0.00 mg/kg
- Total dissolved gas
- 0.50 mg/kg
Totals
- Total dissolved substances
- 180 mg/kg
- Component total
- 180 mg/kg
- Evaporation residue
- 100 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
