was added to each of the runs with 6 kg t of clo 2 plus the additive the results are shown in fig7 a review of fig7 reveals that the additive gives good results at addition rates up to 10 kg t acl as fig7 shows the additive gives a brightness boost as high as 3 iso which is very significant at the end of the bleach plant surprisingly the brightness increase does not seem to level off at the highest addition rates examined the additive appears to work well at all clo 2 addition rates studied it also appears to give a larger brightness boost at low clo 2 charges this could be beneficial as a potential replacement of clo 2 in mills that are not pushing their bleach plant to capacity limits fig8 below replots the data from fig7 in a slightly different manner that allows a more direct comparison of the different application rates the effect of using the additive on the amount of residuals of chemicals used in the bleaching process was also evaluated the results are shown in fig9 a review of fig9 reveals that the additive eliminates any clo 2 and chlorite residuals while increasing chlorate and hypochlorous acid residuals sodium hypochlorite bleaching stages h are believed to cause fairly severe brightness reversion issues a true h stage however runs at high ph u02dc 10 and contains no clo 2 however sodium hypochlorite used according to the present invention is believed to be converted to hypochlorous acid due to the stage ph it is further believed that the hypochlorous acid reacts with the pulp and should not cause severe reversion issues accordingly reverted brightness.