continued bleaching for 25 min sup b as per table i sup c as per table i sup d as per table i sup e thiourea mixed with hydrogen peroxide and ph adjusted with no prio time for oxidative bleaching it is noteworthy that the same level of whiteness is reached at a bleaching temperature of 55 u00b0 c with the hydrogen peroxide thiourea bleaching system oxidative reductive as at 70 u00b0 c with the hydrogen peroxide system alone furthermore the former process is less damaging to the wool as evidenced by lower alkali solubilities ______________________________________acidic bleach bath composition______________________________________hydrogen peroxide 30 w w 20 0 ml l of liquorprestogen nb w 3 43 g l of liquortriton x 100 1 0 g l of liquorinitial ph of bleach bath 5 7ph after oxidative bleaching for 5 21 hr at 80 u00b0 c weight of wool flannel fabric 10 gliquor to wool ratio 30 milliliter liquor 1 gram of fabric______________________________________ prestogen nb w basf chemicals division charlotte n c is a mixture of organic acid salts in aqueous solution which activates hydrogen peroxide at mildly acid ph values by forming peroxy compounds in this example we demonstrate the effectiveness of the hydrogen peroxide thiourea system on the bleaching efficiency under acidic oxidative bleaching with hydrogen peroxide followed by thiourea the results are shown in table v table v__________________________________________________________________________the effect of thiourea on the oxidative reductive bleaching of woolflannel sup atotal time warp sup e weft sup ethiourea of bleaching whiteness yellowness.