Yugawara Onsen Yugawara No.77
Analysis UnverifiedYugawara Onsen is an ancient spa sung of in the Man'yoshu poetry anthology, and Oku-Yugawara, its innermost reach, is a quiet retreat wrapped in the Fujiki River gorge and deep greenery. Yugawara No.77 is a private source here, a calcium sulfate spring once called a gypsum spring. Its main components are 939.0 mg/kg of sulfate and 398.0 mg/kg of calcium; the water is clear and mild in taste and smell, yet carries a faint toasty note typical of sulfate springs. Soft and weakly alkaline, it clings gently to the skin and has long been valued for soothing cuts and skin troubles, suiting bathers who want a calm soak amid the greenery.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
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 42.0°C the source is slightly hot, so pour water over yourself before entering. The hypotonic water is gentle, but sulfate springs keep you warm long after bathing; drink water often.
With 939.0 mg/kg of sulfate, this calcium sulfate spring has long been known as a water for wounds and is associated with relieving pain. Its soft, weakly alkaline water at pH 7.5 settles gently on the skin, supporting silky skin.
Avoid bathing during acute illness or with serious heart or respiratory conditions. The water is slightly hot, so keep soaks short, and do not bathe after alcohol or right after meals. Adjust bathing time to how you feel.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Yugawara Onsen Yugawara No.77
- Spring type
- Calcium Sulfate Spring
- Old spring type name
- 石膏泉
- Source temperature
- 42℃
- pH
- 7.5
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2008-11-05
- Analyst organization
- 財団法人北里環境科学センター
- Registration No.
- 神奈川県知事登録第2号
Cations
- Lithium ion Li⁺
- < 0.001 mg/kg
- Sodium ion Na⁺
- 18.6 mg/kg
- Potassium ion K⁺
- 0.58 mg/kg
- Magnesium ion Mg²⁺
- 1.5 mg/kg
- Calcium ion Ca²⁺
- 398 mg/kg
- Aluminum ion Al³⁺
- 0.01 mg/kg
- Manganese ion Mn²⁺
- 0.02 mg/kg
- Zinc ion Zn²⁺
- 0.25 mg/kg
- Lead ion Pb²⁺
- < 0.001 mg/kg
- Strontium ion Sr²⁺
- 1.6 mg/kg
- Barium ion Ba²⁺
- 0.01 mg/kg
- Copper ion Cu²⁺
- 0.00 mg/kg
- Total cations
- 0.42 mg/kg
Anions
- Fluoride ion F⁻
- 0.21 mg/kg
- Chloride ion Cl⁻
- 11.5 mg/kg
- Sulfate ion SO₄²⁻
- 939 mg/kg
- Bicarbonate ion HCO₃⁻
- 53.7 mg/kg
- Total anions
- 1.0 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 36.0 mg/kg
- Metaboric acid HBO₂
- 0.16 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 1.4 mg/kg
Totals
- Component total
- 1.5 mg/kg
- Evaporation residue
- 1.8 mg/kg
Usage
- Heating
- Yes
- Dilution
- No
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- No
Indications & Contraindications
- Bathing indications
- 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)
Drinking
- Drinkability
- Not drinkable
