Abstract: A chronopotentiometry technique for studying the interaction of spectral sensitive dye with silver bromide is described. This method is based on the principle that the transition time of the silver bromide will be reduced with increasing the amount of sensitizing dye-silver bromide inert compound.The experiment indicates that transition time and reduce potential of silver bromide are decreased by addition of the spectral sensitizing dye. The equilibirum constant of the spectral sensitive' dye-silver bromide inert compounds is computed.There are some relation sbetween the amount of the inert compound and the characteristic increasing emulsion sensitivity of the dyes.

Key words: Chronopotentiometry, Silver bromide emulsion, Sensitizing dyes, Mero-cyanine dyes, Photographic sensitivity.