In the plant of a large newspaper, the manufacture of printing plates using photopolymer acrylic resins, in the place of lead, resulted in a series of orthoergic and allergic manifestations in the workers. Chemical analysis resulted in the isolation of a tetraethylene glycol diacrylate, the harmful nature of which was proven by allergological studies. Its replacement by tetrathylene glycol dimethacrylate eliminated the problems seen (study based upon 300 allergological tests).