Substituted triazolopyrimidines and their use in light-sensitive photographic elements

Photographic element comprising a support and at least one light-sensitive silver halide emulsion layer and comprising in said emulsion layer and/or in at least one water-permeable hydrophilic colloid layer coated at the same side of the support as said emulsion layer at least one 7-hydroxy-s-triazoloe-[1,5-a]-pyrimidine, wherein said 7-hydroxy-s-triazolo-[1,5-a]-pyrimidine corresponds to the following general formula:

• ##STR5## wherein:
• each of R.sup.1, R.sup.2, and R.sup.3, which may be the same or different, represents:
• hydrogen,
• a C.sub.1 -C.sub.8 alkyl group, or
• an Alk.sub.1 --X--Alk.sub.2 --Y--group, wherein
• Alk.sub.1 represents a C.sub.1 -C.sub.8 alkyl group or a substituted C.sub.1 -C.sub.8 alkyl group,
• Y represents a single bond, --O--, --S--, --COHN--, --SO.sub.2 NH--, or --NHCONH--,
• X represents--S--, and when Y is not a single bond, X can also represent --O--, and
• Alk.sub.2 represents a C.sub.1 -C.sub.8 alkylene group or a substituted C.sub.1 -C.sub.8 alkylene group,
• R.sup.3 can alternatively represent a C.sub.1 -C.sub.8 alkyl-thio group or a C.sub.1 -C.sub.8 alkyl-thio group, the C.sub.1 -C.sub.8 alkyl of which can be substituted,
• at least one of R.sup.1, R.sup.2, and R.sup.3, however, being other than hydrogen and other than C.sub.1 -C.sub.8 alkyl said 7-hydroxy-s-triazolo-[1,5-a]-pyrimidine being present in an amount sufficient to provide improved stabilization.