An indirect lithographic printing process where a flat printing plate prints onto a rubber blanket that transfers the image onto the See Banknote paper.. The printing plate must be moistened with water before it is inked, the water adhering to the non-image area. See A printing process that is used for printing multi-colour backgrounds of the banknotes. Offset presses that print simultaneously the back and front of the banknote with high accuracy enable security features to be incorporated in perfect register. See Dry and Wet offset printing..