Piezography Sepia K6 inks are six dilutions of pure carbon pigments which are the color of pure carbon, or what is referred to as a warm sepia effect. The inks are subdued and not as saturated as the PiezoTone Carbon Sepia inks. Sepia inks are also susceptible to paper whites which can be used to subtly move the inks warmer of cooler Sepia depending upon the tone of the white. Again this is due to the incredibly small pigment particles. The end result is a perfect marriage of ink and paper. A perfect monotone is produced. Inks are designed to fade less than 5% and shift less than deltaE 2, both below average human perception. These are the longest lasting inks available. There is a zero metamerism effect. The pigment particles are ground using a proprietary nano-technology. The fluid base in conjunction with the pigment produces a very non-clogging formula.