The invention concerns a method for preparing a pigment mix to be used in the coating of a paper web, in which method a water slurry is prepared containing talc and at least one other component of the coating mix such as calcined clay or calcined talc. The invention is characterized by first dispersing talc into a water slurry and thereafter mixing the second component of the coating mix in dry form into the talc slurry prepared in the first stage. This kind of a direct mixing method results in a pigment mix allowing preselected opacity and printability values of the paper to be attained using an appreciably lower proportion of the second component, such as calcined clay or calcined talc, in the mix.