UV curable inks are carefully formulated without the use of raw materials flagged as potential migrants (typically with low molecular weight). UV curable fluids cross-link rapidly, which limits the time that the substrate is in contact with uncured ink and stops the fluids from further penetrating the surface.
LED curable Inks are formulated similarly to UV curable inks, but with carefully selected raw materials to provide optimized LED curing. New EB Inks are formulated similarly to UV and LED cure inks, but without the use of photo initiators. Rather, electron beam irradiation cures the ink completely, creating an odorless, high quality image.
Water-based inks are considered “safe” fluids because they are comprised mostly of water and colorant. Recent advances in available raw materials have enabled water-based inks to do more today than they could just three years ago, but the substrate limitations still exist when compared to the energy curable inks.