Abstract
In the quality control laboratory of a chemical firm, 11 of 16 men developed dermatitis. Of the allergenic substances used, 7 men reacted to benzisothiazolone, 2 to dinitrochlorobenzene, and none to diphenylamine. Two men were negative to all 3 substances. A poorly ventilated humid working environment was thought to be an important contributory factor.

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