Taenoyu Onsen (Kin no Yu)
Analysis UnverifiedThe Taenoyu Onsen (Kin no Yu) source gushes naturally in the gorge of the Sendatsu River that runs through the Nyuto Onsenkyo, and it earns the name "golden water" as its iron shifts from gold to deep brown on meeting the air. At pH 2.9 its acidic water tightens the skin while its sulfates let warmth linger in the body. It suits travelers who wish to restore body and mind in a spirited spring to the sound of the mountain stream.
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.
An iron-rich spring whose water turns yellow-brown to red-brown when exposed to air. Strong heat retention.
The aroma typical of sulfur springs, with circulatory and antibacterial effects.
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 2.9 this acidic spring can sting sensitive skin, so start with short soaks and rinse lightly with fresh water afterward. Its iron may stain towels, so darker ones are safer.
At pH 2.9, this acidic spring has long been valued for cleansing the skin and is traditionally associated with immune system stimulation. Its 22.9 mg/kg of ferrous iron may also support rejuvenation on chilly, tiring days.
Those with sensitive skin or mucous membranes should avoid this acidic spring, as should anyone with acute illness or serious heart or lung conditions.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Taenoyu Onsen (Kin no Yu)
- Spring type
- Acidic Iron-containing Calcium-Magnesium Sulfate Spring
- Old spring type name
- 酸性含鉄－含正苦味－石膏泉
- Source temperature
- 85.6℃
- pH
- 2.9
- Flow rate
- 650 L/min
- Flow type
- 自然湧出
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2012-09-27
- Analyst organization
- 財団法人 秋田県総合保健事業団 児桜検査センター
- Registration No.
- 秋田第3号
Cations
- Hydrogen ion H⁺
- 1.3 mg/kg
- Sodium ion Na⁺
- 39.6 mg/kg
- Potassium ion K⁺
- 7.1 mg/kg
- Ammonium ion NH₄⁺
- 0.50 mg/kg
- Magnesium ion Mg²⁺
- 45.1 mg/kg
- Calcium ion Ca²⁺
- 83.1 mg/kg
- Aluminum ion Al³⁺
- 4.5 mg/kg
- Manganese ion Mn²⁺
- 3.2 mg/kg
- Iron(II) ion Fe²⁺
- 22.9 mg/kg
- Iron(III) ion Fe³⁺
- 10.6 mg/kg
- Zinc ion Zn²⁺
- 0.07 mg/kg
- Lead ion Pb²⁺
- < 0.01 mg/kg
- Strontium ion Sr²⁺
- 0.20 mg/kg
- Copper ion Cu²⁺
- < 0.01 mg/kg
- Cadmium ion Cd²⁺
- < 0.005 mg/kg
- Total cations
- 0.22 mg/kg
Anions
- Fluoride ion F⁻
- 1.1 mg/kg
- Chloride ion Cl⁻
- 16.6 mg/kg
- Hydrogen sulfide ion HS⁻
- < 0.1 mg/kg
- Thiosulfate ion S₂O₃²⁻
- < 0.1 mg/kg
- Sulfate ion SO₄²⁻
- 577 mg/kg
- Iodide ion I⁻
- 0.10 mg/kg
- Hydrogen sulfate HSO₄⁻
- 24.4 mg/kg
- Nitrate ion NO₃⁻
- 0.20 mg/kg
- Total anions
- 0.62 mg/kg
Undissociated Components
- Arsenious acid HAsO₂
- < 0.1 mg/kg
- Metasilicic acid H₂SiO₃
- 223 mg/kg
- Metaboric acid HBO₂
- 2.3 mg/kg
- Total undissociated
- 0.23 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 19.3 mg/kg
- Free hydrogen sulfide H₂S
- 1.0 mg/kg
- Total dissolved gas
- 0.02 mg/kg
Totals
- Total dissolved substances
- 1.1 mg/kg
- Component total
- 1.1 mg/kg
- Evaporation residue
- 1.1 mg/kg
Usage
- Usage status
- Unknown
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