were performed according to the guidelines of the Spanish Contact Dermatitis Research Group (abbreviated in Spanish to GEIDAC) using the standard GEIDAC series and a rubber series (Chemotechnique, Malmö, Sweden). Readings at 48 and 96 hours were positive (++) for the carba mix, the thiuram mix, the black rubber mix, tetramethylthiuram monosulfide, tetramethylthiuram disulfide, N-cyclohexylN-phe...