obtained are shown in tables 3 and 4 it can be seen that the brightener preparation according to the invention from example 2 in the polyvinyl alcohol containing coating slip showed substantially improved build up behavior with respect to the cie whiteness compared with the preparation from example 3 which is not according to the invention the procedure is as in use example 1 was practiced except that a polyvinyl alcohol containing coating slip of another composition was employed and the brightener preparations from example 1 were used in concentrations of 1 4 5 and 8 based on the pigment content of the coating slip the polyvinyl alcohol used was polyviol u00ae ll 603 wacker chemie the water content was chosen so that a solids content of 50 results the coating slip was divided into 3 parts and the above mentioned amounts of the brightener preparation from example 1 were added to one part each the whiteness parameters of the papers obtained are shown in table 5 the procedure is as in use example 3 was practiced but instead of 8 parts of polyvinyl alcohol 8 parts of carboxymethylcellulose finnfix u00ae 10 noviant were used the whiteness parameters of the papers obtained are shown in table 5 1 part 4 5 parts and 8 parts based on pigment of the brightener preparation from.