Mixed ripeners for silver halide emulsion formation

A method of forming a silver halide emulsion comprising nucleating silver bromide nuclei while in reactive contact with ammonia, digesting said nuclei, bringing a thioether into reactive contact with said nuclei, and growing the nuclei by addition of silver ion, iodide and bromide, wherein during a period that extends for 1 to 95 percent of the growth of the grain, the pH is maintained at between 9 and 10, wherein the grains of said silver halide emulsion have an iodide content of between 5 and 20% iodide, and wherein the grains of said emulsion have a size of between 0.5 and 2.5 .mu.m.