Ishida Onsen
Analysis UnverifiedIshida Onsen's source flows naturally on the flanks of Mt. Esan, an active volcano, and is piped about 2.5 km down, inheriting the spring once used by a highland hotel. The 1984 analysis shows pH 2.1 and 5.518 g/kg of dissolved solids, with 2,972 mg/kg of sulfate plus abundant aluminum and iron, in the lineage of classic alum and green-vitriol springs. Clear at the source, the water oxidizes to a cloudy yellow-brown in the bath, with a squeaky feel, sour taste and metallic scent that speak of the volcano.
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.
An iron-rich spring whose water turns yellow-brown to red-brown when exposed to air. Strong heat retention.
Undissociated boric acid with antibacterial action that keeps the skin surface clean.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
Oxidized iron. Tints the water reddish-brown, lending a visually dramatic, "powerful" bath feel.
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 pH 2.1 the water is strongly acidic, so start with short soaks and keep it away from eyes and cuts. Rinse lightly with fresh water and moisturize afterward, and remove jewelry, as the iron can stain metal and towels.
Its strong pH 2.1 acidity and 2,972 mg/kg of sulfate tighten the skin and are traditionally associated with immune system stimulation, while iron- and aluminum-rich waters have long had a place in balneotherapy for cleansing the skin.
At pH 2.1 the water can irritate sensitive or dry skin; keep it from eyes and cuts, avoid long soaks, rinse with fresh water, and consult a doctor during acute illness.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Ishida Onsen
- Spring type
- Acidic Iron(II,III)-containing Aluminum Sulfate Spring
- Source temperature
- 42.5℃
- pH
- 2.1
- Flow type
- 自然湧出
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 1984-05-21
- Analyst organization
- 北海道立衛生研究所
Cations
- Hydrogen ion H⁺
- 7.9 mg/kg
- Sodium ion Na⁺
- 43.4 mg/kg
- Potassium ion K⁺
- 3.6 mg/kg
- Ammonium ion NH₄⁺
- 2.6 mg/kg
- Magnesium ion Mg²⁺
- 62.5 mg/kg
- Calcium ion Ca²⁺
- 253 mg/kg
- Aluminum ion Al³⁺
- 433 mg/kg
- Manganese ion Mn²⁺
- 3.4 mg/kg
- Iron(II) ion Fe²⁺
- 156 mg/kg
- Iron(III) ion Fe³⁺
- 30.5 mg/kg
- Lead ion Pb²⁺
- not detected
- Copper ion Cu²⁺
- 0.03 mg/kg
- Total cations
- 1.00 mg/kg
Anions
- Fluoride ion F⁻
- 3.0 mg/kg
- Chloride ion Cl⁻
- 447 mg/kg
- Sulfate ion SO₄²⁻
- 2972 mg/kg
- Hydrogen sulfate HSO₄⁻
- 795 mg/kg
- Dihydrogen phosphate H₂PO₄⁻
- 0.50 mg/kg
- Total anions
- 4.2 mg/kg
Undissociated Components
- Sulfuric acid H₂SO₄
- 16.0 mg/kg
- Arsenious acid HAsO₂
- 2.5 mg/kg
- Metasilicic acid H₂SiO₃
- 237 mg/kg
- Metaboric acid HBO₂
- 50.6 mg/kg
- Total undissociated
- 0.31 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 578 mg/kg
- Free hydrogen sulfide H₂S
- 0.40 mg/kg
- Total dissolved gas
- 0.58 mg/kg
Totals
- Total dissolved substances
- 5.5 mg/kg
- Component total
- 6.1 mg/kg
- Evaporation residue
- 5.9 mg/kg
Usage
- Heating
- No
- Dilution
- No
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- No
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
