Abstract: Solutions of some compounds containing sulfur and nitrogen, such as 1-phenyl-5-mercapto-tetrazole (PMT),6-nitro-benzimidazole nitrate.5-nitro-benzimidazole,5-nitro-indazole,4-hydroxy-6-methyl-1,3,3a,7-tetraazaindene (TAI) and thioacetamide,were used to treat samples of sulfur sensitized cubic AgBr emulsion before and after exposure,respectively.Comparisons between sensitometric curves obtained from samples treated by solutions of these compounds before exposure and from ones treated after exposure showed that PMT at a certain range of concentrations had a positive effect on the latent image formation and a negative on the development. Either 6-nitro-benzimidazole nitrate or 5-nitro-benzimidazole had not significant effect on the latent image formation, but rather signficant inhibition on the development.5-nitro-indazole had both inhibitions on the latent image formation and on the development.TAI was of a striking stimulation on the latent image formation and not on the development. Thioacetamide had both inhibitions on the latent image formation and on the development and increased fog as well.

Key words: imaging process, sensitometric effect of organic addenda, organic compounds with S and N