drying of the sample at room temperature 23 u00b0 c and then measuring the brightness reverted brightness following a proceedure analogous to that described in example 1 for the reductive bleaching of southern pine groundwood with edta chromium ii complex recycled newsprint northern pine groundwood npgw and southern pine groundwood spgw are reductively bleached by the catalysts listed in table 1 at the catalyst concentration temperature of treatment and for the times shown in the table the initial final and reverted brightness determined as in example 1 are also tabulated table 1__________________________________________________________________________ initial final reverted reductive bl agent bright bright bright bleaching conc duration temp ness ness nesspulp type agent m m 1 hours u00b0 c ge ge ge __________________________________________________________________________npgw sodium 3 2 5 60 64 9 75 5 hydro sulfitenpgw v edta 2 0 5 60 64 9 81 4 74 4 1 2 spgw v dacta 5 0 24 25 60 8 74 9 1 1 spgw v oxine 5 0 17 25 60 8 71 6 64 0 1 3 spgw v dacta 5 0 2 86 60 8 66 7 1 1 recycled cr dtpa 5 0 3 85 56 0 72 3 65 9newsprint 1 1 __________________________________________________________________________ notes 1 newsprint was deinked by standard methods employed in the industry 2.