The Effect of Common Contactants on Cutaneous Reactivity to Sensitizers**From the Kettering Laboratory and the Department of Dermatology, College of Medicine, University of Cincinnati, Cincinnati, Ohio, and from the Divisions of Environmental Medicine and Dermatology, University of Oregon Medical School, Portland, Oregon.This investigation was supported in part by Research Grant E1451 from the National Institutes of Health, United States Public Health Service, and in part by U.S. Army Research and Development Command under Contract No. DA-49-139-MD-2184.