Viscosity can be simply defined as the internal resistance to flow. The more viscous a printing ink is, the
slower or more difficult, comparatively, its passage through pumps, pipes and filters, the slower will be its
absorption by paper, the sharper it will print, the less it will strike through and the less it will tend to
misting. These statements on relations between viscosity and printability naturally apply only within the
limits of commonly used newsinks. The greater the mean molecular weight of the total binding agent and
the higher the pigmentation, the greater will be the viscosity
for offset printing, highly viscous, pasty ink are necessary . the ink must bu structured in such a way that the drying components in the ink do not harden while being spread over the rollers in the inking unit or at the subsequent transfer station such as the printing plate and blanket. furthermore, the printing ink for conventional offset printing