Izumi Tonic strengthening hair mask with rice water for brittle hair. Izumi - source in Japanese - strengthens and energizes the hair and is inspired by yu-su-ru, the ancient Japanese tradition of bathing the hair in rice water. This rich balm, used together with izumi tonic, strengthens, thickens, moisturizes and gives radiant shine to the hair. The hair is soft, supple and full of radiance. Application After cleansing with Izumi Tonic Shampoo, apply to hair lengths and ends, leave on for 5 minutes and rinse. Finish with Izumi Tonic Serum.