Rainbow Printing
A special security printing method using one printing plate to obtain prints where one colour gradually merges into another. The printing is carried out with several inks from one color box divided by plates. Special rollers with fixed axial displacement in horizontal direction are used for printing.
a
b
Fig. 1. Republic of Belarus. Passport issued in 1997:
a — page spread (front endpaper – page 1). Paper substrate; b — the same. Background pattern. Rainbow printing. The violet color of lines gradually merges into red
a
b
Fig. 2. Switzerland. Diplomatic passport issued in 2003:
a — page spread (data page – page 1). Paper substrate (page 1), polymer substrate (data page); b — the same. Rainbow printing. The green color gradually merges into red