AMBER Yufuin
Analysis VerifiedThis is a newly drilled source in the Yufuin Onsen area, which boasts one of the largest outputs in Japan. Nestled at the foot of Mt. Yufu, this hot spring resort has long been cherished for therapeutic bathing. The AMBER Yufuin source features a high alkalinity of pH 8.9, combining the qualities of a bicarbonate spring that smooths the skin by removing old keratin, and a chloride spring that helps retain body heat. It is particularly characterized by its abundance of metasilicic acid, a natural moisturizing component.
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.
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.
With a gentle, weakly alkaline pH of 8.9, this spring is kind to the skin. However, as the source temperature is a high 68.1°C, bathing should occur where water is added and the temperature is regulated. Rather than long soaks, repeated shorter dips ("bunkatsuyoku") are recommended. The chloride components will coat your skin, preventing chills after your bath.
Thanks to its pH 8.9 alkalinity and bicarbonate ions, this spring offers a "silky skin" effect, gently removing old keratin for a smooth feel. Furthermore, its rich metasilicic acid content of 360 mg/kg acts as a natural moisturizer. The high chloride ion content also creates a salt veil on the skin, providing "restorative warmth" that helps retain body heat after your bath.
The spring temperature is extremely high at 68.1°C, so be sure to bathe in a tub where water has been added and the temperature is properly adjusted. Those with general contraindications for onsen should avoid bathing.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- AMBER Yufuin
- Spring type
- Sodium Chloride and Bicarbonate Hot Spring
- Old spring type name
- 含重曹食塩泉
- Source temperature
- 68.1℃
- pH
- 8.9
- Flow type
- 動力揚湯
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2024-12-10
- Analyst organization
- 公益社団法人大分県薬剤師会
- Registration No.
- 大分県第3号
Cations
- Lithium ion Li⁺
- 0.30 mg/kg
- Sodium ion Na⁺
- 262 mg/kg
- Potassium ion K⁺
- 29.4 mg/kg
- Ammonium ion NH₄⁺
- 0.40 mg/kg
- Calcium ion Ca²⁺
- 1.7 mg/kg
- Total cations
- 0.29 mg/kg
Anions
- Fluoride ion F⁻
- 0.40 mg/kg
- Chloride ion Cl⁻
- 183 mg/kg
- Hydroxide ion OH⁻
- 0.10 mg/kg
- Thiosulfate ion S₂O₃²⁻
- 0.30 mg/kg
- Sulfate ion SO₄²⁻
- 48.1 mg/kg
- Bicarbonate ion HCO₃⁻
- 282 mg/kg
- Carbonate ion CO₃²⁻
- 52.2 mg/kg
- Bromide ion Br⁻
- 0.50 mg/kg
- Hydrogen phosphate HPO₄²⁻
- 0.50 mg/kg
- Total anions
- 0.57 mg/kg
Undissociated Components
- Sulfuric acid H₂SO₄
- 0.00 mg/kg
- Phosphoric acid H₃PO₄
- 0.00 mg/kg
- Arsenious acid HAsO₂
- 0.20 mg/kg
- Metasilicic acid H₂SiO₃
- 360 mg/kg
- Metaboric acid HBO₂
- 9.5 mg/kg
- Total undissociated
- 0.37 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 0.00 mg/kg
- Free hydrogen sulfide H₂S
- 0.00 mg/kg
- Total dissolved gas
- 0.00 mg/kg
Totals
- Total dissolved substances
- 1.2 mg/kg
- Component total
- 1.2 mg/kg
- Evaporation residue
- 0.94 mg/kg
Usage
- Usage status
- Unknown
Indications & Contraindications
- Bathing indications
- Cuts and grazes, Peripheral circulatory failure, Poor circulation, Depression, Xeroderma, Chronic pain or stiffness in muscles and joints (chronic rheumatoid arthritis, osteoarthritis, low back pain, neuralgia, frozen shoulder, bruises, sprains), Muscle stiffness due to motor paralysis, Poor circulation, Peripheral circulatory failure, Gastrointestinal dysfunction, High blood pressure (mild), Impaired glucose tolerance (diabetes), Dyslipidemia (mild), Mild asthma or emphysema, Hemorrhoid pain, Autonomic instability, Stress-induced symptoms (insomnia, depression), Post-illness recovery, Fatigue recovery, Health promotion, Cuts and grazes, 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), Active stages of illness (especially with fever), active tuberculosis, advanced malignant tumors or severe anemia causing significant physical weakness, severe heart or lung disease causing shortness of breath with slight movement, severe kidney disease with swelling, gastrointestinal bleeding, visible bleeding, acute exacerbation of chronic illness
Drinking
- Drinkability
- Not drinkable
