Abstract: In this paper the effect of magnetic treatment on the preparation of silver halide emulsion in gelatin by single jet method was reported.SEM photographs and size distribution curves showed that silver halide grain with magnetic treatment was more sizable and better dispersed particles with bigger diameter.Mechanism analysis of crystallization processes indicates that the magnetic treatment has reduced the hydration of the ions and the disorder of the system.It is considered that the difference between silver halide emulsions obtained by method with and without magnetic treatment results from the two factors mentioned above.

Key words: magnetic treatment, single jet method, silver halide emulsion