Process for the preparation of high chloride tabular grain emulsions (II)

A process of preparing a radiation sensitive high aspect ratio tabular grain emulsion, wherein tabular grains of less than 0.3 .mu.m in thickness and an average aspect ratio of greater than 8:1 account for greater than 50 percent of the total grain projected area, said tabular grains containing at least 50 mole percent chloride, based on silver, comprising

• introducing silver ion into a gelatino-peptizer dispersing medium containing a stoichiometric excess of chloride ions with respect to the silver ions further characterized by a chloride ion concentration of less than 0.5 molar and a grain growth modifier of the formula:
• ##STR20## where Z.sup.2 is --C(R.sup.2).dbd. or --N.dbd.;
• Z.sup.3 is --C(R.sup.3).dbd. or --N.dbd.;
• Z.sup.4 is --C(R.sup.4).dbd. or --N.dbd.;
• Z.sup.5 is --C(R.sup.5).dbd. or --N.dbd.;
• Z.sup.6 is --C(R.sup.6).dbd. or --N.dbd.;
• with the proviso that no more than one of Z.sup.4, Z.sup.5 and Z.sup.6 is --N.dbd.;
• R.sup.2 is H, NH.sub.2 or CH.sub.3 ;
• R.sup.3, R.sup.4 and R.sup.5 are independently selected, R.sup.3 and R.sup.5 being hydrogen, hydroxy, halogen, amino or hydrocarbon and R.sup.4 being hydrogen, halogen or hydrocarbon, each hydrocarbon moiety containing from 1 to 7 carbon atoms;
• and
• R.sup.6 is H or NH.sub.2.