Yuhanazawa No.3, No.5 and No.6 Combined Source
Analysis UnverifiedThe Yuhanazawa No.3, No.5 and No.6 Combined Source gathers three springs welling up in the Yuhanazawa district of Takayu Onsen, a spa said to have opened in the Keicho era and once counted among the "Three Takayu of Oshu" alongside Zao and Shirabu. Tart at pH 2.6 and scented with powdery sulfur, its water gushes from the spouts in a blizzard of white mineral flakes, steeping the tubs in a milky blue. It suits travelers seeking a genuine mountain sulfur soak.
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.
The source of the distinctive sulfur smell. Dilates blood vessels via skin and inhalation to strongly boost circulation.
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.
With an acidic pH of 2.6 and plenty of hydrogen sulfide, start with short soaks split into several rounds, then rinse lightly with fresh water afterward to ease skin irritation. Remove silver jewelry, which tarnishes quickly.
Holding 24 mg/kg of free hydrogen sulfide at pH 2.6, this acidic sulfur water has long been cherished as a skin-soothing bath and is traditionally associated with immune system stimulation through balneotherapy. Its 182.7 mg of metasilicic acid and calcium-rich gypsum may support silky skin.
Not suited to people with sensitive skin or mucous membranes, especially photosensitivity, or to elderly dry skin. Mind ventilation, as the water contains hydrogen sulfide.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Yuhanazawa No.3, No.5 and No.6 Combined Source
- Spring type
- Acidic 含硫黄 カルシウム and アルミニウム-硫酸塩 Hot Spring (hydrogen sulfide type)
- Old spring type name
- 酸性硫化水素温泉
- Source temperature
- 45.3℃
- pH
- 2.6
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2024-05-27
Cations
- Hydrogen ion H⁺
- 2.4 mg/kg
- Sodium ion Na⁺
- 51.6 mg/kg
- Potassium ion K⁺
- 20.2 mg/kg
- Magnesium ion Mg²⁺
- 22.6 mg/kg
- Calcium ion Ca²⁺
- 88.0 mg/kg
- Aluminum ion Al³⁺
- 29.3 mg/kg
- Manganese ion Mn²⁺
- 1.1 mg/kg
- Iron(II) ion Fe²⁺
- 0.60 mg/kg
- Lead ion Pb²⁺
- < 0.005 mg/kg
- Copper ion Cu²⁺
- < 0.01 mg/kg
- Total cations
- 0.22 mg/kg
Anions
- Fluoride ion F⁻
- 1.6 mg/kg
- Chloride ion Cl⁻
- 56.8 mg/kg
- Hydrogen sulfide ion HS⁻
- 0.00 mg/kg
- Thiosulfate ion S₂O₃²⁻
- 0.10 mg/kg
- Sulfate ion SO₄²⁻
- 622 mg/kg
- Bicarbonate ion HCO₃⁻
- 0.00 mg/kg
- Carbonate ion CO₃²⁻
- 0.00 mg/kg
- Hydrogen sulfate HSO₄⁻
- 52.6 mg/kg
- Total anions
- 0.73 mg/kg
Undissociated Components
- Sulfuric acid H₂SO₄
- 0.30 mg/kg
- Metasilicic acid H₂SiO₃
- 183 mg/kg
- Metaboric acid HBO₂
- 6.8 mg/kg
- Total undissociated
- 0.19 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 48.4 mg/kg
- Free hydrogen sulfide H₂S
- 24.0 mg/kg
- Total dissolved gas
- 0.07 mg/kg
Totals
- Total dissolved substances
- 1.1 mg/kg
- Component total
- 1.2 mg/kg
- Evaporation residue
- 1.1 mg/kg
Usage
- Heating
- No
- Dilution
- No
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- No
Indications & Contraindications
- Bathing indications
- Atopic dermatitis, Plaque psoriasis, Chronic eczema, Epidermal suppuration, Impaired glucose tolerance (diabetes), 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), Severe chronic dermatitis (sulphur springs), Sensitive skin or mucous membranes, eye conditions (acidic springs)
Drinking
- Drinkability
- Not drinkable
