Color Soft is applied to natural dry hair, before shampooing. All the shades can be mixed one with the other. Color Soft is used in a radio of 1 to 2, together with the Color Soft Developing Foam. As it is a coloring shade over a shade, Color Soft does not frighten the natural base of the hair. It does not contain ammoniac, so the color remains in place on the upper layers of the hair cortex. The Salerm semi-permanent dye ensures a good coverage of gray hair up to 100% as the same time as caring for the hair, thanks to the extracts of sage and rosemary. The recommended waiting time is 15-20 minutes, depending on the porousness of the hair.