When all printing inks are in exact alignment relative to each other, e.g. the separate colour images in fourcolour printing, or during subsequent die-cutting, cutting, embossing etc. Misregister occurs when the separate colour images are not printed exactly on top of each other. Misregister creates unclear images, discoloured edges, etc. To avoid misregister it is important that the cartonboard sheet is dimensionally stable (see “DIMENSIONAL STABILITY”).