The Influence of Ripening Restrainers upon the Formation of Silver Sulphide

Paper presented at a Symposium on “Radioisotopes in photographic Research” organized by the Science Committee of the Royal Photographic Society on 8 May 1967 at U.K. A.E.A., Harwell.

Abstract

When a photographic emulsion is sensitized in the presence of increasing concentrations of the restrainer 7-hydroxy-5-melhyl 5-triazolo-(l, 5-o) pyrimidine, silver sulphide formation is at first retarded, but later accelerated. With increasing concentrations of the restrainer I-phenyl-tetrazoline-5-thione, however, sulphide formation is at first accelerated and later retarded. These phenomena can be largely explained by a consideration of the differences in solubility products of the silver salts of the two restrainers. The effect of the two restrainers on light sensitivity is also considered.

Notes

Paper presented at a Symposium on “Radioisotopes in photographic Research” organized by the Science Committee of the Royal Photographic Society on 8 May 1967 at U.K. A.E.A., Harwell.