No. 37, 50, 110 Mixed
Analysis VerifiedHakone Yumoto Onsen, the historic gateway to Hakone Onsenkyo, opened in the Nara period and flourished as the foremost of the 'Hakone Nanayu' (Seven Hot Springs of Hakone) during the Edo period. This particular hot spring vein, a pillar of the region's heritage, offers thick, soft waters that gently envelop the skin, promoting deep relaxation for both mind and body. After bathing, the wonderfully smooth skin feel provides a comforting embrace, inviting guests to forget daily hustle and bustle and indulge in self-care.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
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.
This alkaline simple spring with a pH of 8.8 is often called a "skin-beautifying spring" for its expected effect of softening the skin's keratin. As the temperature is slightly high at 48.4°C, avoid long soaks and start with a 3 to 10-minute bath to acclimate your body. After bathing, it's best not to rinse off the minerals.
Characterized by its high alkalinity with a pH of 8.8, this spring is said to gently remove old skin cells, leaving the skin smooth. The pleasant 48.4°C temperature warms the body to its core, promoting blood circulation. Containing sodium (144 mg/kg) and chloride (126 mg/kg) ions, it also helps retain body heat after bathing.
Avoid bathing if you have active tuberculosis, malignant tumors, severe heart disease, or other progressive illnesses. Caution is also advised during early and late pregnancy. Entering hot springs suddenly can cause dizziness, so acclimate your body to the water slowly.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- No. 37, 50, 110 Mixed
- Spring type
- Alkaline Simple Hot Spring
- Source temperature
- 48.2℃
- pH
- 8.8
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2004-12-13
- Analyst organization
- 神奈川県温泉地学研究所
- Registration No.
- 神奈川県知事登録第1号
Cations
- Lithium ion Li⁺
- 0.01 mg/kg
- Sodium ion Na⁺
- 144 mg/kg
- Potassium ion K⁺
- 1.5 mg/kg
- Magnesium ion Mg²⁺
- 0.05 mg/kg
- Calcium ion Ca²⁺
- 22.8 mg/kg
- Aluminum ion Al³⁺
- 0.03 mg/kg
- Manganese ion Mn²⁺
- 0.00 mg/kg
- Iron(II) ion Fe²⁺
- 0.00 mg/kg
- Zinc ion Zn²⁺
- 0.00 mg/kg
- Lead ion Pb²⁺
- 0.00 mg/kg
- Strontium ion Sr²⁺
- 0.00 mg/kg
- Copper ion Cu²⁺
- 0.00 mg/kg
- Cadmium ion Cd²⁺
- 0.00 mg/kg
- Total cations
- 0.17 mg/kg
Anions
- Fluoride ion F⁻
- 0.32 mg/kg
- Chloride ion Cl⁻
- 126 mg/kg
- Hydroxide ion OH⁻
- 0.14 mg/kg
- Sulfate ion SO₄²⁻
- 131 mg/kg
- Bicarbonate ion HCO₃⁻
- 30.5 mg/kg
- Carbonate ion CO₃²⁻
- 1.9 mg/kg
- Nitrate ion NO₃⁻
- 1.8 mg/kg
- Hydrogen metasilicate HSiO₃⁻
- 8.1 mg/kg
- Metaborate ion BO₂⁻
- 2.4 mg/kg
- Total anions
- 0.30 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 51.5 mg/kg
- Metaboric acid HBO₂
- 4.8 mg/kg
- Total undissociated
- 0.06 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 0.06 mg/kg
- Total dissolved gas
- 0.00 mg/kg
Totals
- Total dissolved substances
- 0.51 mg/kg
- Component total
- 0.53 mg/kg
Usage
- Heating
- No
- Dilution
- No
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- No
Indications & Contraindications
- Bathing indications
- Nerve pain, Muscle pain, Joint pain, Stiff shoulders, Muscle stiffness due to motor paralysis, Bruises, Sprains, Chronic digestive diseases, Hemorrhoids, Poor circulation, Recovery from illness, Fatigue recovery, Health promotion
- Contraindications
- Acute illness (especially with fever), Active tuberculosis, Malignant tumors, Severe heart disease, Respiratory failure, Renal failure, Hemorrhagic diseases, Severe anemia, Other progressive diseases, Pregnancy (especially early and late stages)
Drinking
- Drinkability
- Not drinkable
