Participation of gelatin amino groups in silver halide emulsions sensitization with organothio compounds

There was delivered a comparative study of chemical sensitization of AgBr emulsions by various dasses of organosulfur compounds. It was established that the activity of a sensitizer is defined predominantly by the rate of nucleophilic substitution of sulfur. In water solutions of amines and gelatin the mainstream process of nucleophilic substitution of sulfur is aminolysis. The rate of hydrolysis of compounds under study is neglegebly small in comparison with that of the process mentioned above. Hence the amino groups of gelatin take part in the process of sulfide sensitization.