Piezography K7 Neutral ink is available in seven shades. It is a matte paper only formulation because it does not contain even a trace of dye. Piezography Neutral inks are achromatic (without color) and are formulated to appear neutral to the human eye on paper which has the tone of Photo Rag and Innova Photo Cotton Smooth. The ink will appear warmer or cooler if the user chooses papers which are warmer or cooler than these standards. Piezography Neutral inks have virtually zero metamerism and fade. This is a superior quality ink designed for highest standard black & white printing. The best results are gained by using Piezography made profiles for QuadTone RIP.