Recent developments decrease the amount of residual solvents, substitute toluene, and minimize solvent emission. Water-based inks are of increasing interest, especially in the field of packaging materials, because when using these inks, there is no VOC emission. But more than threefold to fivefold energy is required in the drying unit than is required with solvent-based inks, and this also involves print quality problems. The typical structure of gravure printing ink is shown in Table 12.1.