This permanent hair color deposits pigment deep into the hair strand to give you saturated color results that last. The formula has a low concentration of ammonia to gently open up the hair cuticles to allow the color to deposit. The color will leave your hair shiny and healthy-looking. What else you need to know: This hair color is great for covering up stubborn grays. It will cover up to 100% grey hair with just one application. Available in the shade 4ABn “Dark Roast”.