優彩の温泉
Yusai Onsen- Aches & jointsstiff shoulders
- Circulationtired legs
- Warmingcold sensitivity
A sodium sulfate-chloride spring emerging at 79.2 °C — among Japan's hottest natural sources, cooled for bathing. Weakly alkaline at pH 8.5 with that soft, slippery feel of the beauty-water family, layered with sulfate body and a salty edge for heat retention. Metasilicic acid at 110 mg/kg leaves the kind of thin silica film that makes skin feel noticeably smoother afterwards.