Latent Multicolour Image
An image formed by parallel lines applied by blind embossing and multicolor parallel lines of the background pattern applied by offset printing. The lines are combined during the printing process. At a right angle of observation and illumination, the latent multicolor image is almost invisible. It is visualized in sliding light at an acute angle of observation. When the document is rotated clockwise without changing the angle of observation, the color of every element of the multicolor image changes.
Fig. 1. Scheme of observing a latent multicolor image
a
b
c
d
Fig. 2. Kosovo. Passport issued in 2011:
a — page spread (page 34 – back endpaper). Paper substrate; b — the same. Back endpaper. Latent multicolor image. Viewed at an acute angle in sliding light; c — the same. The color of the RKS symbols has changed. Viewed when the document is rotated by 90° clockwise without changing the angle of illumination and observation; d — the same. Zoomed fragment. The lines of the latent multicolor image are parallel with the lines of the background pattern