Dye-based inks
Dye, unlike pigment, dissolves completely in solution (pigment-based inks leave tiny particles floating in the solution). This means that dye-based inks are entirely absorbed into the paper that they are printed on - the image is in fact a highly controlled stain. The resulting images can thus appear very slick and even, with a vast range of subtle colours and extremely fine detail. However, dye-based inks are more susceptible to the harmful effects of UV light than pigment-based inks, and should be kept out of direct sunlight. And since they are soluble they should also be kept away from water, which causes them to run. Images printed with archival dye-based inks onto archival paper will last for at least 70 years if stored in the proper conditions.