About Black Water
Kokubisui (Black Water) hot spring in takenoyu is like black coffee like hot coffee as its name suggests. This is because the ancient plants changed substances (peat), mud of the sea floor, volcanic ash, etc dissolved into the groundwater. "Well, do you get dirty like mud?" The fountain color of takenoyu hot spring is "black brown clear". It's not cloudy, it's a transparent name. It is completely dissolved in water, so it will not cling to your body. When you see it first you will get surprised but don't worry, its really good for your skin.