Onsen Bath Salts (湯の華・入浴剤 - Yunohana / Salts)
Concentrated Japanese bath salts ('Nyuyokuzai') or natural hot spring mineral crystals ('Yunohana') that replicate onsen mineral benefits in your home bathtub, making it one of the most popular souvenirs from resort towns.
Born from Japan's absolute obsession with baths. Famous towns like Kusatsu or Hakone package their unique volcanic spring minerals, allowing travellers to enjoy their properties back in their home countries.
Fill your home tub with hot water, add one packet of Yunohana powder, and stir well. The water will transform into a milky white or herbal emerald hue, spreading a relaxing sulfur/cypress aroma.
What is the popular volcanic mineral bath powder sold as an onsen souvenir called?