Okuhida Gaaden Hoteru Yakedake Gensen
Analysis UnverifiedA blessed spring gushing forth in Okuhida Onsen-go, nestled in the heart of the Northern Alps. With a long history of healing the minds and bodies of travelers and bathers, this source is renowned as a 'silky skin spring' due to its abundant bicarbonate ions that smooth the skin. As you immerse yourself, the faint scent of hydrogen sulfide will help release you from the hustle and bustle of daily life. It is recommended for those who wish to refresh both mind and body and seek deep tranquility in nature.
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.
A "beauty spring" that gently emulsifies dead skin cells, leaving skin smooth after bathing.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
Absorbed through the skin to gently promote peripheral circulation.
The aroma typical of sulfur springs, with circulatory and antibacterial effects.
- Chloride (salt)382 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.
- Bicarbonate (baking soda)1408 mg/kg
- Feel
- Your skin feels smooth and silky.
- Said to
- Said to remove old skin cells and excess sebum. Bathing indications include cuts, poor circulation and dry skin.
- Note
- It can leave skin dry—moisturize after bathing.
- Metasilicic acid175 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 temperature57.2℃
- 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.
As the temperature is high at 57.2°C, it's best to avoid long soaks and instead take several short dips. The bicarbonate spring softens the skin's outer layer, so applying moisturizer after bathing will enhance the silky smooth feeling.
Gentle on the skin with a neutral pH of 6.67, the abundant bicarbonate ions (1408 mg/kg) exfoliate old skin cells, leading to silky skin. Additionally, chloride ions create a veil on the skin, providing restorative warmth that prevents post-bath chills. This onsen is recommended for those seeking rejuvenation and relief from daily fatigue.
The spring water is hot, so be careful not to get overheated and remember to stay hydrated. Avoid bathing if you are not feeling well.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Okuhida Gaaden Hoteru Yakedake Gensen
- Spring type
- Sodium Bicarbonate and Chloride Hot Spring
- Source temperature
- 57.2℃
- pH
- 6.67
- Flow rate
- 226 L/min
- Flow type
- Pumped
- Osmotic pressure
- Hypotonic
Analysis Document
- Analysis date
- 2000-11-29
- Analyst organization
- (社)長野県薬剤師会 検査センター
Cations
- Hydrogen ion H⁺
- 3.4 mg/kg
- Lithium ion Li⁺
- 0.49 mg/kg
- Sodium ion Na⁺
- 514 mg/kg
- Potassium ion K⁺
- 35.3 mg/kg
- Ammonium ion NH₄⁺
- 0.10 mg/kg
- Magnesium ion Mg²⁺
- 50.8 mg/kg
- Calcium ion Ca²⁺
- 117 mg/kg
- Manganese ion Mn²⁺
- 0.10 mg/kg
- Iron(II) ion Fe²⁺
- 1.7 mg/kg
- Zinc ion Zn²⁺
- 0.00 mg/kg
- Lead ion Pb²⁺
- 0.00 mg/kg
- Strontium ion Sr²⁺
- 1.5 mg/kg
- Barium ion Ba²⁺
- 0.80 mg/kg
- Cadmium ion Cd²⁺
- 0.00 mg/kg
- Total cations
- 725 mg/kg
Anions
- Fluoride ion F⁻
- 1.0 mg/kg
- Chloride ion Cl⁻
- 382 mg/kg
- Hydroxide ion OH⁻
- 0.00 mg/kg
- Hydrogen sulfide ion HS⁻
- 0.30 mg/kg
- Sulfate ion SO₄²⁻
- 0.50 mg/kg
- Bicarbonate ion HCO₃⁻
- 1408 mg/kg
- Bromide ion Br⁻
- 0.80 mg/kg
- Iodide ion I⁻
- 0.30 mg/kg
- Hydrogen phosphate HPO₄²⁻
- 0.10 mg/kg
- Total anions
- 1793 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 175 mg/kg
- Metaboric acid HBO₂
- 56.6 mg/kg
- Total undissociated
- 232 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 408 mg/kg
- Free hydrogen sulfide H₂S
- 0.60 mg/kg
- Total dissolved gas
- 409 mg/kg
Totals
- Total dissolved substances
- 2749 mg/kg
- Component total
- 3158 mg/kg
- Evaporation residue
- 1952 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, Xeroderma, Depression
- 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
