Dake Onsen (Ryokan Association Collection Tanks No. 4-5 and 6-8)
Analysis UnverifiedDake Onsen's association source feeds a spa village said to have opened in 1674. Its self-flowing water is piped several kilometers down from the slopes of Mt. Iwaki, and the local association flushes sulfur deposits from the pipes every month. Listed in Edo-period hot spring rankings, its sharply sour, sulfurous water suits travelers seeking an old-fashioned toji retreat.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.
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.
Absorbed through the skin to gently promote peripheral circulation.
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 2.03 the water is strongly acidic, so keep it out of your eyes and take several short soaks. The source runs at 48.2°C, so test the temperature near the spout, and rinse with fresh water afterward to spare sensitive skin.
With a pH of 2.03, this acidic water has long been used in toji cures for skin troubles, a classic of balneotherapy. Holding 213.1 mg/kg of metasilicic acid, it may support silky skin after bathing.
As a strongly acidic spring, it may irritate sensitive or dry skin. It contains hydrogen sulfide, so mind ventilation, rinse your eyes with fresh water at once if splashed, and remove metal jewelry.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Dake Onsen (Ryokan Association Collection Tanks No. 4-5 and 6-8)
- Spring type
- Acidic Sulfur-containing Calcium Chloride Spring
- Source temperature
- 48.2℃
- pH
- 2.03
- Flow type
- 自然湧出
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2012-12-10
- Analyst organization
- 社団法人 青森県薬剤師会 衛生検査センター
- Registration No.
- 青森県第2号
Cations
- Hydrogen ion H⁺
- 9.4 mg/kg
- Lithium ion Li⁺
- 0.20 mg/kg
- Sodium ion Na⁺
- 129 mg/kg
- Potassium ion K⁺
- 16.8 mg/kg
- Ammonium ion NH₄⁺
- 1.4 mg/kg
- Magnesium ion Mg²⁺
- 59.5 mg/kg
- Calcium ion Ca²⁺
- 276 mg/kg
- Aluminum ion Al³⁺
- 53.2 mg/kg
- Manganese ion Mn²⁺
- 3.0 mg/kg
- Iron(II) ion Fe²⁺
- 5.5 mg/kg
- Iron(III) ion Fe³⁺
- 1.5 mg/kg
- Zinc ion Zn²⁺
- 0.10 mg/kg
- Lead ion Pb²⁺
- 0.03 mg/kg
- Copper ion Cu²⁺
- < 0.01 mg/kg
- Cadmium ion Cd²⁺
- < 0.005 mg/kg
- Total cations
- 0.55 mg/kg
Anions
- Fluoride ion F⁻
- 7.5 mg/kg
- Chloride ion Cl⁻
- 1130 mg/kg
- Hydrogen sulfide ion HS⁻
- 0.00 mg/kg
- Thiosulfate ion S₂O₃²⁻
- 2.6 mg/kg
- Sulfate ion SO₄²⁻
- 289 mg/kg
- Bicarbonate ion HCO₃⁻
- 0.00 mg/kg
- Carbonate ion CO₃²⁻
- 0.00 mg/kg
- Bromide ion Br⁻
- 2.0 mg/kg
- Iodide ion I⁻
- 0.20 mg/kg
- Hydrogen sulfate HSO₄⁻
- 90.8 mg/kg
- Dihydrogen phosphate H₂PO₄⁻
- 0.40 mg/kg
- Sulfide ion S²⁻
- 0.00 mg/kg
- Total anions
- 1.5 mg/kg
Undissociated Components
- Sulfuric acid H₂SO₄
- 2.1 mg/kg
- Arsenious acid HAsO₂
- 0.20 mg/kg
- Metasilicic acid H₂SiO₃
- 213 mg/kg
- Metaboric acid HBO₂
- 20.5 mg/kg
- Total undissociated
- 0.24 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 677 mg/kg
- Free hydrogen sulfide H₂S
- 0.80 mg/kg
- Total dissolved gas
- 0.68 mg/kg
Totals
- Total dissolved substances
- 2.3 mg/kg
- Component total
- 3.0 mg/kg
- Evaporation residue
- 2.1 mg/kg
Usage
- Heating
- No
- Dilution
- No
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- No
Indications & Contraindications
- Bathing indications
- Atopic dermatitis, Plaque psoriasis, Epidermal suppuration, Impaired glucose tolerance (diabetes), Chronic eczema, Cuts and grazes, Peripheral circulatory failure, Poor circulation, Depression, Xeroderma
- General indications
- High blood pressure (mild), Rheumatoid arthritis, Autonomic instability, Insomnia, 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), Sensitive skin or mucous membranes, eye conditions (acidic springs), Severe chronic dermatitis (sulphur springs)
Drinking
- Drinkability
- Not drinkable
