Use the Satin Developer that best fits your hair, mix with Satin Color into a rich, creamy, stay-put application. | The silicone base in the Satin Developer provides a color-protecting barrier on the hair fiber, resulting in a much longer retention of color. | 10 Volume is used to go tone-on-tone darker. | 20 Volume is used to deposit tone-on-tone or lift up to two levels of natural color. | 30 Volume lifts up to three levels of natural color.