| 摘要 |
PROBLEM TO BE SOLVED: To provide a hair dyeing agent which comprises a powdery body of Ryukyu indigo (Assam indigo) containing indican at high concentration, and to provide an extremely highly usable hair dyeing agent which is preservable in a pasty state while using indigo.SOLUTION: The hair dyeing agent contains dried leaves of Ryukyu indigo (Assam indigo) which is produced by rapidly heating raw leaves of the indigo using latent heat of condensation of steam at 100°C or higher. It is preferable to set heating time after the temperature of raw leaves reached 80°C to 10 to 90 seconds. Further, a first powdery body produced by performing heat treatment to the raw leaves of the indigo to deactivate indican-degrading enzyme and a second powdery body containing indican-degrading enzyme are mixed at a predetermined ratio, and the mixed powdery body is mixed and kneaded with water into a pasty state, and then frozen. Furthermore, black color-based hair dye can be realized by adding powdery body of Ryukyu henna. |
