Tengu no Yu
Analysis UnverifiedTengu no Yu gushes naturally in the mountain hollow of Doroyu Onsen, a spa said to have opened in the early Heian period. Its name comes from a legend: a sick maiden too shy to bathe in clear water was helped by a tengu who clouded the spring white, and she was healed after soaking in it. The Tengu no Yu source swirls with white mineral flakes and mud-like sediment, leaving the skin feeling soft and supple, a steeping place for anyone who loves cloudy, remote hot springs.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
The aroma typical of sulfur springs, with circulatory and antibacterial effects.
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.
The source exceeds 70°C and is cooled with added water, so temperatures vary between tubs; test with your hand first. Mud-like sediment settles on the bottom, so enter slowly to avoid stirring it up, and remove silver jewelry because of the sulfur.
This mildly acidic pH 3.7 sulfur spring has long been used for toji stays and is traditionally associated with immune system stimulation, while 62.5 mg/kg of metasilicic acid may support silky skin that feels smooth long after bathing.
Hydrogen sulfide gas occurs around Doroyu Onsen; never enter restricted areas, keep baths ventilated and take care near the scalding spouts.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Tengu no Yu
- Spring type
- Simple Sulfur Hot Spring
- Source temperature
- 71.9℃
- pH
- 3.7
- Flow type
- 自然湧出
Analysis Document
- Analysis date
- 2014-09-04
- Analyst organization
- 株式会社秋田県分析化学センター
- Registration No.
- 秋田第2号
Cations
- Hydrogen ion H⁺
- 0.20 mg/kg
- Sodium ion Na⁺
- 6.1 mg/kg
- Potassium ion K⁺
- 0.70 mg/kg
- Ammonium ion NH₄⁺
- 0.50 mg/kg
- Magnesium ion Mg²⁺
- 2.7 mg/kg
- Calcium ion Ca²⁺
- 9.2 mg/kg
- Aluminum ion Al³⁺
- 3.0 mg/kg
- Iron(II) ion Fe²⁺
- 3.8 mg/kg
- Iron(III) ion Fe³⁺
- 1.0 mg/kg
- Lead ion Pb²⁺
- < 0.05 mg/kg
- Cadmium ion Cd²⁺
- < 0.005 mg/kg
- Total cations
- 0.03 mg/kg
Anions
- Fluoride ion F⁻
- 0.20 mg/kg
- Chloride ion Cl⁻
- 3.0 mg/kg
- Thiosulfate ion S₂O₃²⁻
- 8.0 mg/kg
- Sulfate ion SO₄²⁻
- 69.6 mg/kg
- Hydrogen sulfate HSO₄⁻
- 0.50 mg/kg
- Nitrate ion NO₃⁻
- 0.60 mg/kg
- Total anions
- 0.08 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 62.5 mg/kg
- Total undissociated
- 0.06 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 36.7 mg/kg
- Free hydrogen sulfide H₂S
- 0.60 mg/kg
- Total dissolved gas
- 0.04 mg/kg
Totals
- Total dissolved substances
- 0.17 mg/kg
Usage
- Heating
- No
- Dilution
- Yes（館内掲示『加水 有：源泉の温度が高いので加水しています』（天狗の湯・川の湯）。公式『加水・加温・減温の有無：加水あり』。大露天風呂（新湯）も温泉手帖で『気温により加水』。）
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- No
Indications & Contraindications
- Bathing indications
- Atopic dermatitis, Plaque psoriasis, Chronic eczema, Epidermal suppuration
- General indications
- High blood pressure (mild), Rheumatoid arthritis, Autonomic instability, 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), Severe chronic dermatitis (sulphur springs)
Drinking
- Drinkability
- Not drinkable
