applied product dyeings being 38 and less than 5 if the identical test is run without the product of the invention being present the amount of dye transferred is 12 and the amount of dye left in the bath less than 5 if the identical test is run with a 6 o w g of a product formulated on the basis of biphenyl a common carrier active ingredient the following values are obtained dye transferred 24 dye left in bath 11 one pound packages of texturized polyester yarn are dyed on a laboratory high temperature package dyeing apparatus with 2 o w g of ci disperse blue 81 under conditions which are typical for today 39 s high speed production liquor flow 50 l kg min rate of temperature rise 4 u00b0 c minute liquor flow direction inside out after the maximum dyeing temperature of 130 u00b0 c is reached dyeing is continued for 15 minutes at this temperature if the dyeing is executed in the presence of 3 o w g of the levelling agent of example 1 a dyeing that is level i e contains a uniform dye concentration from inside to outside of the package is obtained if the dyeing is executed in the presence of 3 of a product based on a common carrier active ingredient with strong accelerating properties such as o dichlorobenzene a substantially unlevel dyeing is obtained with differences from inside to the middle of the package of 12 in dye concentration a dyeing of 2 o w g of a ci disperse red 159 is prepared on qiana u00ae modified nylon fabric in.