温泉神社硫黄泉・からすの湯1号泉・からすの湯2号泉・下地獄5号泉・下地獄9号泉・下地獄16号泉 混合泉
Onsen-jinja Iou-sen / Karasu-no-yu #1 & #2 / Shimo-jigoku #5, #9, #16 Mixed SpringMixed source
Sampled at mixing tank
酸
Acidic
+ 含硫黄泉 · Iron-bearing
Classification
Sodium Sulfate spring
A blended source pooling six wells from the Naruko district — the Onsen-jinja sulfur spring together with the Karasu-no-yu and Shimo-jigoku families. The water is strongly acidic at pH 2.5, sharp enough to prickle the skin and eyes, layered with the unmistakable sulfur note of H₂S and the metallic edge of iron(II) that lends a faint amber cast. At 181.8 mg/kg of metasilicic acid, the silica film softens the bite slightly, but the temperament stays in the family that Naruko is renowned for: long documented relief for stubborn skin conditions.
Source temperature
43.9°C
Hot
Tonicity
1.20g/kg
Hypotonic
Free CO₂
165mg/kg
Low
Free H₂S
16mg/kg
Very high
Highlights
- Ultra-acidic
- Iron-rich
- High silica
Analyzed Jul 9, 2020·公益財団法人 宮城県公害衛生検査センター·Cert no. 第1196号