| abstract |
A hydrazide compound of the general formula 1:- wherein U is a unsubstituted or substituted alkylene or arylene group with up to 8 carbon atoms, n and m are 1 or 0 and may be equal or different, R 1 and R 2 are independently an alkyl or isoalkyl group containing 1 - 4 carbon atoms, a substituted alkyl, an alkoxy or aralkoxy group with up to 12 carbon atoms, or a halogen and where either R 1 or R 2 can also be hydrogen, or R 1 and R 2 together can form an aromatic or a partially unsaturated ring, R 3 is H or alkyl with up to 4 carbon atoms, A + is a activity regulating group, and G - is an anion, can be used in photographic silver halide materials to provide good dot quality. |