Yubatake
Analysis VerifiedThe Yubatake source, a symbol of Kusatsu Onsen—one of Japan's three most celebrated hot springs—is historically known as "Shogun Okumiage no Yu," as the Tokugawa Shogunate once had its waters transported to Edo Castle. Gushing over 4,000 liters per minute, its strongly acidic waters are distinctive for their pungent sulfurous aroma and a tingling sensation on the skin. This invigorating spring is believed to awaken the mind and body, promoting a sense of rejuvenation and contributing to silky skin. After a soak, bathers feel remarkably refreshed and light. Cooled as it flows through traditional wooden channels, this esteemed hot spring promises to restore vitality for those seeking a complete reset.
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.
Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.
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 a pH of 2.0, this is one of Japan's most acidic springs, so caution is advised for those with sensitive skin or the elderly. Start with a short dip of about 3 minutes. It's recommended to rinse off with fresh water after bathing to avoid irritation. Avoid contact with eyes.
The remarkable acidity of pH 2.0 addresses skin concerns like atopic dermatitis. Furthermore, sulfate and chloride ions within the 1.83 g/kg total of dissolved components help improve poor circulation. The 52.3°C source is perfect for days when you want to relieve physical and mental tension.
Avoid bathing during active illness, with severe heart conditions, or if you have sensitive skin or mucous membranes. Use caution if you have dry skin, especially elderly individuals. Do not bathe immediately after meals or alcohol consumption.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Yubatake
- Spring type
- 酸性・含硫黄-アルミニウム-硫酸塩・塩化物温泉 (硫化水素型)
- Source temperature
- 52.3℃
- pH
- 2
- Flow type
- 自然湧出
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2023-07-25
- Analyst organization
- 一般社団法人 群馬県薬剤師会
- Registration No.
- 群馬藥第2号
Cations
- Hydrogen ion H⁺
- 10.0 mg/kg
- Sodium ion Na⁺
- 59.7 mg/kg
- Potassium ion K⁺
- 30.0 mg/kg
- Ammonium ion NH₄⁺
- 0.50 mg/kg
- Magnesium ion Mg²⁺
- 39.4 mg/kg
- Calcium ion Ca²⁺
- 73.1 mg/kg
- Aluminum ion Al³⁺
- 49.1 mg/kg
- Manganese ion Mn²⁺
- 2.0 mg/kg
- Iron(II) ion Fe²⁺
- 17.8 mg/kg
- Lead ion Pb²⁺
- 0.01 mg/kg
- Copper ion Cu²⁺
- 0.00 mg/kg
- Total cations
- 0.28 mg/kg
Anions
- Fluoride ion F⁻
- 10.1 mg/kg
- Chloride ion Cl⁻
- 329 mg/kg
- Sulfate ion SO₄²⁻
- 674 mg/kg
- Hydrogen sulfate HSO₄⁻
- 227 mg/kg
- Total anions
- 1.2 mg/kg
Undissociated Components
- Sulfuric acid H₂SO₄
- 5.7 mg/kg
- Metasilicic acid H₂SiO₃
- 243 mg/kg
- Metaboric acid HBO₂
- 9.8 mg/kg
- Total undissociated
- 0.26 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 46.9 mg/kg
- Free hydrogen sulfide H₂S
- 6.2 mg/kg
- Total dissolved gas
- 0.05 mg/kg
Totals
- Total dissolved substances
- 1.8 mg/kg
- Component total
- 1.8 mg/kg
- Evaporation residue
- 1.6 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
