The shade Natural Brown (3) is a strong and versatile opaque brown hue that creates the most natural brown appearances. It can be mixed with Light Brown (3.1) to create customized brown shades. It can be blended with all 8 shades. The Intense Black (1) is a natural black shade that is highly recommended for tinting eyelashes and eyebrows in black or dark brown color. It can be mixed with all 8 RefectoCil shades.