Abstract: Several kinds of hollow silver halide microcrystals were prepared by the methods of halogen displacement and epitaxial growth. The holes in the hollow silver halide microcrystals were observed by Scanning Electron Microscope. It is found that by the means of Br-I and Cl-I halogen displacement, hollow grains can be formed when relatively small amount of KI is added to the system, while of Cl-Br displacement, hollow grains appear only when theoretical degree of displacement is higher.

Key words: hollow silver halide grains, emulsion preparation