A substantially inert ultraviolet absorbing compound, and photographic elements containing them, which compound has a peak absorption at less than 400 nm and being of formula : ##STR1## wherein: X is O or NR8, Z represents the atoms necessary to complete {HEAD ~ a 5 membered or 6 membered heterocyclic ring} which includes X and {TAIL ~ N}, and the 3 position of the pyrazolone ring may independently be substituted or unsubstituted 
includes
A substantially inert ultraviolet absorbing compound , and photographic elements containing them , which compound has a peak absorption at less than 400 nm and being of formula : # # STR1 # # wherein : X is O or NR8 , Z represents the atoms necessary to complete { HEAD ~ a 5 membered or 6 membered heterocyclic ring } which includes X and { TAIL ~ N } , and the 3 position of the pyrazolone ring may independently be substituted or unsubstituted
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH