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Pigmented ink particles tend to settle into the tiny fibers that make up the paper. As the ink dries, the pigment particles get stuck in the fibers. Thus, the pigmented inks are more water-resistant than the dye-based inks. Only about 5 to 10 percent of the ink will dissolve into the water if the paper is wetted. Dye-based ink tends to fade quicker, since all of the molecules are exposed to the chemical and sunlight-caused reactions that fade the ink. You may notice fading of dye-based inks exposed to direct sunlight commonly in 6 to 12 months. Pigment particles being "hidden" in the fibres. It is much more difficult for sunlight and chemicals to react with all of the pigment molecules. Pigmented inks therefore will usually last for many years before fading becomes noticeable.  Also the small particle size allows sharper image detail on even low-grade paper as the ink is less susceptible to bleeding and wicking on the paper fibers.