Silver halide photographic elements with particular blue sensitization

A photographic element comprising a silver halide emulsion of at least 90 mol % silver chloride, having a maximum sensitivity in the visible region at less than or equal to 475 nm, and being sensitized by a dye of formula (Ia):

• ##STR15## wherein:
• R.sub.1 and R.sub.2 are, independently, an alkyl group;
• Z represents an aromatic group or heteroaromatic group that is directly appended to the benzene ring shown;
• the benzene rings shown in formula (Ia) can be further substituted or not, and;
• A' is one or more ions as needed to balance the charge on the molecule.

A photographic element comprising a silver halide emulsion of at least 90 mol % silver chloride which has a maximum sensitivity in the visible region at less than or equal to 475 nm and which is sensitized by a dye of formula (Ib):

• ##STR16## wherein:
• R.sub.1 and R.sub.2 are, independently, 1 to 8 carbon alkyl groups, at least one of which is substituted by an acid or acid salt;
• Z is a phenyl group, pyrrolo group, furyl group or thiophene group that is directly appended to the benzene ring shown, and;
• A' is one or more ions as needed to balance the charge on the molecule.