Salty water. The salt leaves a thin film on the skin, so you stay warm well after leaving the bath.
Bicarbonate spring 炭酸水素塩泉
Smooth, slightly slippery water. Often nicknamed bihada-no-yu, the water for beautiful skin.
Sulfur spring 硫黄泉
The classic rotten-egg smell and milky white water. It can tarnish silver jewellery, so take it off.
More photographs
From Wikimedia Commons. Tap a photo for the photographer and licence.
With tattoos
Many public baths still turn away visible tattoos, and the rule is set by each bath, not by the town. The reliable way round it is to bathe privately: a room with its own open-air bath, or an inn with a private bath you can book for yourselves.