Process of producing silver halide photographic emulsions

A process of producing a silver halide photographic emulsion containing tabular silver halide grains having an aspect ratio of 5 or more, which comprises using silver halide fine grains as prepared by the following method in at least one of a nucleation step and a growth step of the production of silver halide emulsion,

• the method comprising introducing at least two solutions into a mixer to prepare silver halide fine grains, wherein the mixer is provided with at least two introduction ports and at least one discharge port;
• a first solution is introduced as a jet flow from a first introduction port;
• the mixer is provided with a region where the jet flow slows down;
• a second solution is introduced from a second introduction port as a flow having a vector in the vertical direction to the jet flow of the first solution;
• an inner diameter of the mixer is larger than an inner diameter of each of the introduction ports to generate the maximum velocity of each of the introduced solutions;
• the discharge port of the mixer has an inner diameter smaller than the inner diameter of the mixer;
• and the introduction port of the second solution is provided in a position at which a velocity Vz of the jet flow of the first solution in the direction (Z direction) where the jet flow of the first solution introduced exhibits the maximum velocity meets the following requirement:
• ({fraction (1/10)})Vz0<Vz<Vz0
• wherein Vz0 represents a velocity in the Z direction when the jet flow comes into the slowing-down region.