Abstract
During the investigation of an outbreak of dermatitis in a medium-sized engineering works, the authors discovered four patients with allergic contact sensitivity to hexahydro,1,3,5, tris (2-hydroxyethyl) triazine, (Grotan), a new bacteriocidal agent used in coolant liquids. The authors failed to find any published report on this subject and would like to draw attention to Grotan as a new potential sensitizer.