Ramune Onsen
Analysis UnverifiedRamune Onsen is the emblematic source of Nagayu Onsen, one of Japan's best-known carbonated-spring villages, named for the bubbles that fizz like ramune soda. Once privately owned, it is said to have gushed naturally at about 184 liters per minute. At just over 31°C, the water coats the skin in silvery bubbles, and a gentle warmth lingers in the body after leaving the bath, rewarding bathers who steep slowly in its fizz.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
Bubbles cling to the skin and dilate blood vessels — the "heart spring." Warms the body even at lukewarm temperatures.
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.
Transdermal absorption gently supports skin hydration and muscle relaxation.
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.
At 31.5°C the water feels cool at first, but staying still for 10 to 20 minutes lets bubbles cover the body and warmth slowly build. In cold seasons, alternate with a warmer bath, and sit near the spout for the most bubbles.
With 1,400 mg/kg of free carbon dioxide, the water is traditionally associated with widening blood vessels and boosting circulation, supporting rejuvenation even at a cool temperature. Resting quietly in 31.5°C water near the neutral body threshold may also invite deep relaxation.
As the water is cool, long soaks can chill the body. It is rich in carbon dioxide, so avoid keeping your face near the surface in poorly ventilated spaces.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Ramune Onsen
- Spring type
- Carbon dioxide-containing Magnesium-Sodium Bicarbonate Spring
- Old spring type name
- 含炭酸・重曹－重炭酸土類泉
- Source temperature
- 31.5℃
- pH
- 6.1
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2018-11-21
- Analyst organization
- 公益社団法人大分県薬剤師会 検査センター
- Registration No.
- 大分県第3号
Cations
- Lithium ion Li⁺
- 0.60 mg/kg
- Sodium ion Na⁺
- 215 mg/kg
- Potassium ion K⁺
- 36.5 mg/kg
- Ammonium ion NH₄⁺
- 0.90 mg/kg
- Magnesium ion Mg²⁺
- 143 mg/kg
- Calcium ion Ca²⁺
- 101 mg/kg
- Manganese ion Mn²⁺
- 0.90 mg/kg
- Iron(II) ion Fe²⁺
- 2.9 mg/kg
- Lead ion Pb²⁺
- < 0.01 mg/kg
- Strontium ion Sr²⁺
- 0.60 mg/kg
- Copper ion Cu²⁺
- < 0.05 mg/kg
- Cadmium ion Cd²⁺
- < 0.001 mg/kg
- Total cations
- 0.50 mg/kg
Anions
- Fluoride ion F⁻
- 0.40 mg/kg
- Chloride ion Cl⁻
- 83.8 mg/kg
- Sulfate ion SO₄²⁻
- 193 mg/kg
- Bicarbonate ion HCO₃⁻
- 1250 mg/kg
- Dihydrogen phosphate H₂PO₄⁻
- 0.20 mg/kg
- Total anions
- 1.5 mg/kg
Undissociated Components
- Sulfuric acid H₂SO₄
- 0.00 mg/kg
- Phosphoric acid H₃PO₄
- 0.00 mg/kg
- Arsenious acid HAsO₂
- 0.00 mg/kg
- Metasilicic acid H₂SiO₃
- 172 mg/kg
- Metaboric acid HBO₂
- 4.2 mg/kg
- Total undissociated
- 0.18 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 1400 mg/kg
- Free hydrogen sulfide H₂S
- 0.00 mg/kg
- Total dissolved gas
- 1.4 mg/kg
Trace Components
- Radon Rn
- < 7.4 Bq/kg
Totals
- Total dissolved substances
- 2.2 mg/kg
- Component total
- 3.6 mg/kg
- Evaporation residue
- 1.6 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, Autonomic instability, Xeroderma
- General indications
- High blood pressure (mild), Rheumatoid arthritis, Insomnia, Depression, 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
