Ikaho Onsen Sogo-yu (Kogane-no-yu)
Analysis UnverifiedIkaho is an ancient spa praised in the Man'yoshu poetry anthology. In the Warring States era its stone-step street was laid out as a healing retreat for soldiers wounded at Nagashino, and the koma-guchi system that divides the spring water among the inns survives today. Kogane-no-yu rises clear, but its iron oxidizes in the air and tints the water tea-brown, as its golden name suggests. This neutral water rich in sulfate and bicarbonate warms the body to the core and has long been called a spring for fertility. It is a bath that carries Ikaho's history itself.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
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.
Absorbed through the skin to gently promote peripheral circulation.
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 41.2°C the source is on the mild side, suited to a longer soak that warms you to the core. The neutral pH 6.4 water is gentle, but its iron can stain white towels brown, so a dark towel is a safe choice.
With 284 mg/kg of sulfate and 275 mg/kg of bicarbonate, this water encourages circulation for restorative warmth that lingers after bathing, and a slow soak may ease stiff muscles and joints.
Avoid bathing with fever or active illness, serious heart disease, respiratory or kidney failure, bleeding disorders or severe anemia. Skip bathing after drinking or right around meals, and drink water to avoid dizziness or dehydration on long soaks.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Ikaho Onsen Sogo-yu (Kogane-no-yu)
- Spring type
- Calcium-Sodium Sulfate, Bicarbonate and Chloride Hot Spring
- Source temperature
- 41.2℃
- pH
- 6.4
- Flow rate
- 4,627 L/min
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2017-05-30
- Analyst organization
- 群馬県薬剤師会環境衛生試験センター
Cations
- Sodium ion Na⁺
- 101 mg/kg
- Potassium ion K⁺
- 8.7 mg/kg
- Magnesium ion Mg²⁺
- 32.2 mg/kg
- Calcium ion Ca²⁺
- 139 mg/kg
- Aluminum ion Al³⁺
- < 0.05 mg/kg
- Manganese ion Mn²⁺
- 1.4 mg/kg
- Iron(II) ion Fe²⁺
- 7.2 mg/kg
- Total cations
- 0.29 mg/kg
Anions
- Fluoride ion F⁻
- < 0.1 mg/kg
- Chloride ion Cl⁻
- 146 mg/kg
- Sulfate ion SO₄²⁻
- 284 mg/kg
- Bicarbonate ion HCO₃⁻
- 275 mg/kg
- Carbonate ion CO₃²⁻
- < 0.1 mg/kg
- Total anions
- 0.70 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 181 mg/kg
- Metaboric acid HBO₂
- 8.3 mg/kg
- Total undissociated
- 0.19 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 172 mg/kg
- Free hydrogen sulfide H₂S
- 0.00 mg/kg
- Total dissolved gas
- 0.17 mg/kg
Totals
- Total dissolved substances
- 1.2 mg/kg
- Component total
- 1.4 mg/kg
Usage
- Usage status
- Unknown
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
