Nishinokawara Gensen
Analysis VerifiedNestled in Sainokawara Park, west of Kusatsu Onsen town, flows the Sainokawara Source. Once known as "Oni no Sensui" (Demon's Spring Water), this powerful, untamed natural spring is said to firm the skin and infuse the mind and body with new rejuvenation. Gazing at the steam rising from the hot water as it flows like a river (Yukawa) washes away the clamor of daily life, offering deep relaxation. Alongside the Yubatake Source, Sainokawara Source stands as a symbol of Kusatsu, embracing travelers who seek to reset their mind and body and gain vitality for tomorrow.
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.
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 strong acidity of pH 2.0, caution is advised for those with sensitive skin or dry skin conditions, especially the elderly. It is recommended to rinse off with fresh water after bathing. Avoid long soaks; limit each bath to 3-10 minutes.
As one of Japan's most acidic springs with a pH of 2.0, its sterilizing properties are considered effective for skin conditions like atopic dermatitis and chronic eczema. Additionally, the 277.9 mg/kg of metasilicic acid, a natural moisturizing component, is expected to promote skin metabolism.
Avoid bathing during active illness or if physically weak. Due to the strong acidity, individuals with sensitive skin, mucous membranes, or dry skin, especially the elderly, should be cautious. 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
- Nishinokawara Gensen
- Spring type
- 酸性・アルミニウム－硫酸塩・塩化物温泉
- Source temperature
- 53.7℃
- pH
- 2
- Flow type
- 自然湧出
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2023-08-04
- Analyst organization
- 一般社団法人 群馬県薬剤師会 (環境衛生試験センター)
- Registration No.
- 群馬藥第2号
Cations
- Hydrogen ion H⁺
- 9.6 mg/kg
- Sodium ion Na⁺
- 80.6 mg/kg
- Potassium ion K⁺
- 34.2 mg/kg
- Ammonium ion NH₄⁺
- 0.30 mg/kg
- Magnesium ion Mg²⁺
- 51.7 mg/kg
- Calcium ion Ca²⁺
- 99.8 mg/kg
- Aluminum ion Al³⁺
- 55.8 mg/kg
- Manganese ion Mn²⁺
- 2.4 mg/kg
- Iron(II) ion Fe²⁺
- 16.5 mg/kg
- Lead ion Pb²⁺
- 0.04 mg/kg
- Copper ion Cu²⁺
- 0.00 mg/kg
- Total cations
- 0.35 mg/kg
Anions
- Fluoride ion F⁻
- 13.6 mg/kg
- Chloride ion Cl⁻
- 416 mg/kg
- Sulfate ion SO₄²⁻
- 722 mg/kg
- Hydrogen sulfate HSO₄⁻
- 232 mg/kg
- Total anions
- 1.4 mg/kg
Undissociated Components
- Sulfuric acid H₂SO₄
- 5.6 mg/kg
- Metasilicic acid H₂SiO₃
- 278 mg/kg
- Metaboric acid HBO₂
- 12.4 mg/kg
- Total undissociated
- 0.30 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 66.0 mg/kg
- Free hydrogen sulfide H₂S
- 0.00 mg/kg
- Total dissolved gas
- 0.07 mg/kg
Totals
- Total dissolved substances
- 2.0 mg/kg
- Component total
- 2.1 mg/kg
- Evaporation residue
- 1.8 mg/kg
Usage
- Usage status
- Unknown
Indications & Contraindications
- Bathing indications
- Atopic dermatitis, Plaque psoriasis, 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), Sensitive skin or mucous membranes, eye conditions (acidic springs)
Drinking
- Drinkability
- Not drinkable
