Silver halide photographic emulsions

A light-sensitive silver halide photographic emulsion comprising a sensitizing dye represented by formula (I) and a sensitizing dye represented by formula (II):

• ##STR8## wherein R.sub.1 and R.sub.2 are each a substituted or unsubstituted alkyl group, and at least one of R.sub.1 and R.sub.2 is a sulfoalkyl group or a carboxyalkyl group;
• R is an alkyl group or an aralkyl group;
• W.sub.1, W.sub.2, W.sub.3 and W.sub.4 are each a hydrogen atom, a halogen atom, an aryl group, an alkyl group, a substituted alkyl group, an alkoxy group, an alkoxycarbonyl group, a carboxy group or a hydroxy group, and W.sub.1 and W.sub.2 are not phenyl groups at the same time;
• X is an acid anion;
• n is 1 or 2, and when the sensitizing dye forms an intramolecular salt, n is 1;
• R.sub.4 and R.sub.5 are each a substituted or unsubstituted alkyl group, and at least one of R.sub.4 and R.sub.5 is a sulfoalkyl group or a carboxyalkyl group;
• R.sub.3 is an ethyl group, a propyl group or an aralkyl group;
• V.sub.1, V.sub.2, V.sub.3, V.sub.4, V.sub.5, V.sub.6 and V.sub.7 are each a hydrogen atom, a halogen atom, an aryl group, an alkyl group, a substituted alkyl group, an alkoxy group, an alkoxycarbonyl group, a carboxy group or a hydroxy group, and V.sub.1 and V.sub.2, V.sub.2 and V.sub.3, V.sub.3 and V.sub.4, V.sub.5 and V.sub.6 or V.sub.6 and V.sub.7 may combine together to form a benzene ring;
• X.sub.1 is an acid anion;
• m is 1 or 2, and when the sensitizing dye forms an intramolecular salt, m is 1;
• and
• the number of carbon atoms contained in the alkyl group or alkyl radical is 1 to 4 wherein the sensitizing dyes of formula (II) and formula (I) are present in a molar ratio of 1:2 to 10:1.