the amount of chlorite introduced into the baths the examples of application given below by way of indicative and non limiting illustration will make it possible to define the possibilities of the invention more concretely in these examples all the concentrations are expressed in percentage in relation to the weight of the fabric a previously desized and bleached cotton fabric was dyed with a sulfur dye applied by the dyeing process described below 3 of a blue dye referenced in the color index as sulphur blue 7 after dyeing was performed for 90 minutes at a temperature of 98 u00b0 c the sample was quickly rinsed in cold water then treated for 5 minutes in an aqueous oxidation bath having the following composition the temperature of the oxidation bath was maintained at 60 u00b0 c and the ph adjusted to 5 by addition of acetic acid after treatment a perfectly uniform coloring was obtained the tinctorial characteristics of which corresponded perfectly to the standards of the dye used performed under the same conditions but in the absence of the edta salt in the oxidizing bath the sample obtained showed a very considerable alteration of the shade reflecting a practically total deterioration of the coloring initially achieved the dyeing process carried out was identical.