hand and left hand twisted yarns it is consequently possible to color the recovered size once again nor is there any need to add preservatives such as formaldehyde since in the process according to the invention the regenerated size keeps for a prolonged period even at room temperature although no residues of sodium chlorite or chlorine dioxide are detectable the regenerated size treated according to the invention is as usual returned to the required concentration by renewed addition of solid sizing agent and used for a new sizing process the film forming and sizing properties of the sizing agent are not impaired by the process according to the invention to 10 000 liters of regenerated size containing 4 by weight of sizing agent for 52 kg of sodium chlorite 30 and the regenerated size was then pumped round at 80 u00b0 c for 14 hours the sizing agent was two thirds polyvinyl alcohol and one third carboxymethyl cellulose the process of oxidation took place without the addition of acid donors since the liquor is self activating despite a ph of 6 5 at the end of the stated period all the sodium chlorite had been consumed as indicated by an iodine potassium iodide paper to 400 liters of this regenerated size was then added 12 kg of hydroxypropyl starch and 1 kg of na alkane sulfonate this size was then.