Moire Variable Color (MVC)
(MVC — Moire Variable Colour, developed by GOZNAK, Russia)
An image formed by parallel lines (applied by blind embossing) which are located at an acute angle to multicolor parallel lines of the background pattern (applied by offset printing). The element is monochrome when viewed at a right angle of observation and illumination. Multicolor moire (rainbow) stripes appear when the image is viewed at an acute angle of observation and illumination. When the document is rotated clockwise without changing the angle of observation, the moire patterns appear and disappear from time to time.
Fig. 1. Scheme of observing the MVC
a
b
c
d
Fig. 2. Russian Federation. Passport issued in 2010:
a — page 3. Paper substrate; b — the same. MVC. The element is monochrome. Viewed at a right angle of observation and illumination; c — the same. Viewed at an acute angle in sliding light. Multicolor moire stripes are observed; d — the same. Zoomed fragment. Yellow and blue lines of the background pattern — offset printing. The lines applied by blind embossing are at an acute angle to the lines of the background pattern. View at a right angle of observation and illumination