Colour Shifts in Four Colour Printing

When printing with four colours or more colour shifts depending on natural variations in the level of inking in the printing press can occur. This variation will have negative influence on the grey balance as well as on the colour balance since the variations of the process inks occur randomly and individually i.e. some of the inks can vary in one direction and some in another. This will lead to the fact that density and dot gain can increase or decrease differently for different colours and cause a colour shift.