INSECTICIDES AND REPELLENTS 79 



One person pours the liquid over the uniform in a pan or large bucket 

 while a second person turns and squeezes the cloth to insure even and 

 complete wetting. Where a number of suits are to be treated, it is 

 recommended that a stock emulsion be prepared in a barrel or drum 

 and the required amount (3% to 3){ pints) be dipped out for individual 

 suits. The stock should be stirred occasionally to maintain the emul- 

 sion. It is not advisable to dip the uniforms one after another in the 

 stock emulsion, as this tends to break the emulsion or to change the 

 concentration. After the clothing has been treated, it should be laid 

 out, if possible, on a clean surface to dry or hung on a line. After 

 drying, if the clothing is not to be worn immediately, it should be 

 folded compactly and stored indoors. 



If an emulsifier or an emulsifiable concentrate is not available, 

 Quartermaster-issue laundry soap can be used. The soap should 

 be shaved into cold water, heated to boiling, and the required amount 

 of cold water added to form a 2-percent solution. In a separate dish 

 the repellent is then stirred vigorously into an equal quantity of this 

 soap solution with a wire egg whip (which is a standard item of army 

 kitchen equipment) or other device. This concentrate is diluted with 

 additional soap solution to make the finished emulsion containing 5 

 percent of repellent. One 14-ounce bar of laundry soap, 5% gallons 

 of water, and 34 fluid ounces of repellent provide about the proper 

 quantity of emulsion for wetting 13 uniforms. 



One gallon of the all-purpose mixture M-1960 (pp. 76-77) is sufficient 

 to impregnate 28 full uniforms by hand treatment, or about 13 in a 

 Quartermaster-issue portable laundry. For hand treatment the con- 

 centrate is mixed at the rate of 1 part to 11 parts of water. Approxi- 

 mately 135 ml. of concentrate, or 1,600 ml. of emulsion, per uniform 

 gives the desired dosage of a little more than 3 grams of the active in- 

 gredients per square foot of cloth. The uniforms are treated indi- 

 vidually as previously described. 



Cotton or wool clothing can also be impregnated satisfactorily on a 

 large scale in Quartermaster semimobile laundries. The recommended 

 procedures for impregnating cotton clothing with M-1960 are as 

 follows: 



With 60 pounds of clothing in the washer, follow the usual washing 

 procedure through the last rinse. If it is necessary to save time by 

 altering the procedure, eliminate the third rinse and put sour in the 

 second rinse. Drain the last rinse water from the washer. With the 

 outlet valve to the drain open, roll the washer with the clothing in it 

 for 2 minutes to remove excess water. Close the outlet valve, and 

 with the washer rolling add an emulsion composed of 4 gallons of 

 water and 1% gallons of M-1960. The emulsion should be mixed in 

 a container before being placed in the washer. Roll for 3 minutes. 

 Then drain the emulsion from the washer. Catch the first 4}£ gallons 

 of emulsion that runs from the washer in one container and the re- 

 mainder in a second container. If the volume of emulsion in the latter 

 is 3 gallons or less, the treatment was probably satisfactory. If so, 

 1 gallon of M-1960 is added to the 4}£ gallons of emulsion first recov- 

 ered and used for the next treatment. Discard the emulsion in the 

 second container. 



