Uwanari Gensen
Analysis VerifiedThe Uwanari Gensen is a primary source for Arima Onsen's famous "Kinsen" (Golden Spring). Its name, meaning "jealousy spring," comes from a legend that the water would gush violently with envy whenever a beautiful woman passed by. [3, 6, 7] Once an intermittent spring, it is now drilled and its waters are distributed to many establishments in Arima via other sources like the Gosho Sengen. [3, 6, 7] Rich in iron and salt, this spring is known for its characteristic reddish-brown color upon oxidation and its ability to warm the body to its core.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
Undissociated boric acid with antibacterial action that keeps the skin surface clean.
Salinity comparable to seawater. The salt film traps heat for outstanding warmth ("hot bath spring").
Salt forms a thin film on the skin, retaining heat after bathing. Helps with poor circulation.
An iron-rich spring whose water turns yellow-brown to red-brown when exposed to air. Strong heat retention.
- Iron67 mg/kg
- Feel
- Turns reddish-brown in the air, with a rusty-iron smell.
- Said to
- Said to warm the body; where drinking is permitted, said to help iron-deficiency anemia.
- Note
- May stain white towels and swimwear.
- Chloride (salt)21980 mg/kg
- Feel
- Tastes salty; the warmth lasts after you get out.
- Said to
- Salt is said to form a film on the skin that keeps in heat and moisture. Bathing indications include cuts, poor circulation and dry skin.
- Note
- May sting cuts. Strong salty water can tire you—avoid long soaks.
- Metasilicic acid160 mg/kg
- Feel
- Your skin may feel smoother.
- Said to
- 50 mg/kg or more is said to mark a “skin-beautifying spring”; it is also used in skincare.
- Note
- The “skin-beautifying” label is a common rule of thumb, not a legal standard.
- Source temperature100.5℃
- Feel
- The source is 42°C or hotter; the bath may be on the hot side.
- Said to
- Heat is said to boost circulation and warm the body.
- Note
- Older people and those with high blood pressure or heart conditions should avoid baths of 42°C or more. Keep soaks short.
Effects are general descriptions based on the Ministry of the Environment’s indications by spring type, not a guarantee.
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 is a very hot and concentrated spring, so avoid long soaks and acclimate your body with "kakeyu" (splashing water on yourself) before entering. The high salt content creates a heat-retaining film on the skin, but those with sensitive skin should rinse off lightly with a shower afterward.
With 21980 mg/kg of chloride ions, this hypertonic spring is as salty as seawater, and its most significant feature is its restorative warmth that prevents post-bath chills. [5] Rich in iron, it supports rejuvenation and recovery from fatigue. This form of balneotherapy is ideal for those with poor circulation or muscle pain, warming the body to its core.
Due to the extremely high temperature and concentration of minerals, individuals with high blood pressure or heart conditions should exercise particular caution. Avoid long soaks and do not drink the water.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Uwanari Gensen
- Spring type
- Iron-containing Sodium Chloride strong saline Hot Spring
- Source temperature
- 100.5℃
- pH
- 6.7
- Flow rate
- 120 L/min
- Flow type
- 掘削自噴
- Osmotic pressure
- 高張性
Analysis Document
- Analysis date
- 2019-10-25
- Analyst organization
- 公益財団法人 中央温泉研究所
- Registration No.
- 14健地衛第1号
Cations
- Sodium ion Na⁺
- 10840 mg/kg
- Potassium ion K⁺
- 2045 mg/kg
- Ammonium ion NH₄⁺
- 4.0 mg/kg
- Magnesium ion Mg²⁺
- 13.8 mg/kg
- Calcium ion Ca²⁺
- 1825 mg/kg
- Aluminum ion Al³⁺
- 0.00 mg/kg
- Manganese ion Mn²⁺
- 17.1 mg/kg
- Iron(II) ion Fe²⁺
- 67.0 mg/kg
- Zinc ion Zn²⁺
- 0.05 mg/kg
- Lead ion Pb²⁺
- 0.00 mg/kg
- Copper ion Cu²⁺
- 0.00 mg/kg
- Cadmium ion Cd²⁺
- 0.01 mg/kg
- Total cations
- 14810 mg/kg
Anions
- Fluoride ion F⁻
- 0.30 mg/kg
- Chloride ion Cl⁻
- 21980 mg/kg
- Hydrogen sulfide ion HS⁻
- 0.10 mg/kg
- Thiosulfate ion S₂O₃²⁻
- 0.00 mg/kg
- Sulfate ion SO₄²⁻
- 29.6 mg/kg
- Bicarbonate ion HCO₃⁻
- 298 mg/kg
- Carbonate ion CO₃²⁻
- 0.00 mg/kg
- Bromide ion Br⁻
- 38.7 mg/kg
- Iodide ion I⁻
- 5.1 mg/kg
- Total anions
- 22350 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 160 mg/kg
- Metaboric acid HBO₂
- 272 mg/kg
- Total undissociated
- 432 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 136 mg/kg
- Free hydrogen sulfide H₂S
- 0.20 mg/kg
- Total dissolved gas
- 137 mg/kg
Trace Components
- Radon Rn
- 2 Bq/kg
Totals
- Total dissolved substances
- 37600 mg/kg
- Component total
- 37730 mg/kg
- Evaporation residue
- 37960 mg/kg
Usage
- Heating
- No
- 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
