Nitrogen mustard detectors

Cabbage, cantaloupe, cauliflower, citrus fruit, cottonseed, cucumber, mustard greens, nutmeats, pome fruit, stone fruit, summer squash, tomatoes, soil, and water Gas chromatograph with nitrogen-phosphorus detector... 

By March 1942 a number of blister gas detectors, all of which were based on color changes in a dye base and had their origins in British and American developments in 1918, had been standardized. They included the M4 vapor detector kit, capable of registering even faint concentrations of nitrogen and sulphur mustards M5 liquid vesicant detector paint M6 liquid vesicant detector paper and M7 vesicant detector crayon, sensitive to mustard and lewisite. Although the CWS had not discovered a better dye base than that developed by the British, NDRC chemists at the University of Chicago, at the University of Virginia, and at Ohio State improved its composition and developed new detector materials. ... 

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