To make a test of the new salt water soap developed for the Army say Louise Feldman left, and Frances Montgomery, chemists in the DuPont Technical Laboratory at Deepwater Point, New Jersey. Miss Montgomery, using the new soap khaki colored for camouflage, got the heavy fuel oil off her hand quicker and more easily that Miss Feldman who used ordinary soap. Secret of the new soap's success is a special synthetic detergent, know n only as MP-646, developed by DuPont chemists. Both the laboratory basins contain salt water, often the only kid available to soldiers for bathing and laundry in some theaters of war.
A Launderometer, a machine which tests the fastness of dyes in chemicals used in commercial laundries. Pieces of the dyed fabric are place din the jars with the chemicals and some stainless steel balls. The whole battery of jars is then revolved for the duration of the test.
A Zeiss Pulfrich photometer with a sphere reflectometer attachment, is used for measuring reflection from any surface at various wave lengths of light. The machine is used in the laboratory to test detergency by measuring the brightness of scoured pieces. This equipment is located at the Technical Laboratory in Deepwater Point, New Jersey.
Wash day is a colorful event at the dyestuffs Technical Laboratory of the DuPont Company. Here Miss Dorothy Hampton takes in dyed and printed samples of cloth which have been hung out to test the fastness of colors to alternate laundering and sunlight. The vat dyes will hold up under a great many washings and clothesline dryings.
In testing fabrics for the fastness of dyes in washing, special soaps and soda ash solutions are used. The fabrics are checked for 'bleeding' or running dyes. Fabrics are also laundered in accordance with commercial laundry standards and are given repeated tests on an accelerated basis to represent years of use.
Fabric dyes for printing designs on piece goods are tested on a small press at DuPont's Technical Laboratory Chambers Works. Here a chemist is shown inking the press with color paste. Each batch of dye made at the Chambers Works must agree with the standard set by the Technical Laboratory or it cannot be shipped.
The upper strip is a fastness test record of a vat dye the lower strip a direct dye. The white swatches are undyed materials used in the test to demine whether the dye bleeds onto the adjacent material. If these fabrics are examined carefully, comparison of the equivalent test on each of these colors will quickly demine their relative fastness.
Miss Dorothy Bennett of the DuPont Company's dyestuffs Technical Laboratory mixes lake colors on a lithographer's stone, bringing them to a specified working concentration to make sure they conform to standard.
Testing pigmented plastics at DuPont's new Pigments Sales Service Laboratory. Here operator loads plastic resin into an extruder, while extruded plastic material is cooled in water bath at lower left. In this operation pigment in the plastic is evaluated for dispersion and heat stability of the color.
Vat dyes may be conveniently applied to a wider variety of fabrics than ever before by means of the Multi Lap machine, developed by the DuPont Company's Dyestuffs Division. A working model of the machine is being demonstrated here by William M. Wentz, right, inventor of the machine and G.T. Hug, both of the company's Dyestuffs Division. The fabric enters at right and is carried into and out of the dye bath a number of time by means of multiple laps around an endless conveyor, which subjects it to a minimum of stretching or distortion. The cloth finally emerges from the center of the apparatus.
E.I. du Pont de Nemours & Company (originator), Rittase, William M., 1894-1968 (photographer)
Standard spray testing equipment used to determine the water repellency of a Zelan treated fabric versus an untreated fabric in the DuPont Technical Laboratory, Fine Chemicals Division, Deepwater, New Jersey.
Plastics coloration studies at DuPont's new Pigments Sales Service Laboratory. The panel the technician is working on it is called 'draw-down'. Pigmented samples are cured in a an oven, then tested for heat and light stability and uniformity of pigmentation. The $5 million sales service installation was opened formally on May 21.