black and white pigment ink for special portrait use its features and advantages: (1) carbon black as colorant. its print is not only purely color and lustre but also the highest lightfastness in nature. its keeping time rates even exceed the traditional silver salt photo. (2) the different density blacks are used so that the color rank is added. even the ordinary four-color desktop printer, its print is more exquisite, richer detail performance and smoother color graduation. (3) waterproof absolutely. (4) easy printing. black and white picture is printed directly by color photo.