Allergic contact dermatitis to a diazonium compound in copy paper.

This article focuses on a case study of 56-year-old man who was suffering from vesicular eczema on the palms of both hands and on the volar sides of the fingers. From his past history it was found out that for 3 years, he had worked in a factory where diazosensitized paper was produced. At work, he was exposed continuously to 2 diazo compound containing Radex DL and 5M9. It was observed that during leave, his eczema improved. On patch testing with azodyes and photochemical results were negative. On additional patch testing, patient showed positive response to Radex DL and 5M9 solutions. It was suggested that contact dermatitis in patient occurred due to Radex photocopy paper.