percent______________________________________a mineral oil 55 fatty acid soap 11 sulfonated ester ethoxylate 15 polyethylene glycol ester 12 polyethylene glycol ether 6 triethanolamine 1b mineral oil 55 fatty acid soap 12 sulfonated ester ethoxylate 15 polyethylene glycol ester 12 polyethylene glycol ether 6c coconut oil 59 polyoxyethylene 25 sup a castor oil 15 5 decaglycerol tetraoleate 7 5 glycerol monooleate 3 0 polyoxyethylene 20 sup a sorbitan monooleate 5 0 sulfonated petroleum product 10 0______________________________________ sup a moles of ethylene oxide per mole of base material the biocide utilized was 6 acetoxy 2 4 dimethyl m dioxane the samples obtained were autoclaved at about 138 u00b0 c 280 u00b0 f results of the tests are presented in table ii the results show that yellowing of the nylon is due to the biocide is proportional to polymer amine end groups and independent of spin finish all of the nylon polymers tested showed yellowing at biocide concentrations of 1 percent and the amine terminated nylon polymer showed yellowing at 0 1 percent biocide concentration based on these results several biocides were screened for yellowing on amine terminated nylon polymer yarn bearing spin finish a described in table i results are presented in table iii samples f through m showed no significant yellowing at a biocide concentration of 0 5 percent on an amine terminated nylon polymer yarn the biocide used in these samples f through m were then tested two trials for their ability to control bacteria growth in a finish a table i.