Ecocolors Haircolor is effective on African American Hair. We recommend using it on natural hair (not relaxed hair or chemically treated hair). Ecocolors Haircolor may lighten your medium brown hair slightly. ALWAYS do a strand test and an allergy test according to the kit directions before applying any new color to your entire head. the gray around your face will grow back in at a rate of about a half in a month. Touch ups are easy: Mix equal parts color and developer. Once you mix color and developer, you must use it immediately. Whatever color you do NOT mix with developer may be saved for the following month's application.