Abstract: A method of increasing the viscosity of photographic coating solutions which comprises adding polymers having therein the repeating unit represented by the following formula (but having a maleic acid content of more than about 40% by mol' ##STR1## wherein R represents a hydrogen atom or a t-butyl group, and M.sub.1 and M.sub.2 each represents a cation, which may be identical or different from each other, to gelatin containing photographic coating solutions.

Abstract: A color photographic light-sensitive material comprising a support having thereon at least one layer of a silver halide photographic emulsion with the light-sensitive material containing at least one hydroquinone compound represented by the following general formula (I): ##STR1## wherein R.sup.1 represents a hydrogen atom, ##STR2## or a precursor thereof.

Abstract: Methine dyes represented by the following general formulae (A), (B) or (C): ##STR1## wherein R.sub.1 represents an alkyl group (which may be substituted), an aralkyl group (which may be substituted), an aryl group (which may be substituted), a 5- or 6-membered heterocyclic residue, a carboxyl group, an alkoxycarbonyl group, an aryloxycarbonyl group or an amino group (which may be substituted); R.sub.2, R.sub.3, R.sub.4 and R.sub.5, which may be the same or different, each represents an alkyl group (which may be substituted), an aralkyl group (which may be substituted), an aryl group (which may be substituted) or a 5- or 6-membered heterocyclic residue, with R.sub.2 additionally representing a hydrogen atom; Z represents an atomic group necessary to form a heterocyclic nucleus containing a 5- or 6-membered hetero ring; Y.sub.1 and Y.sub.

Abstract: A method of flocculating a gelatin-silver halide photographic emulsion, which comprises flocculating the silver halide with gelatin at a pH of 6 or less in the presence of a polymer consisting essentially of recurring units represented by General Formula (Ia) or (Ib): ##STR1## in which R.sup.1 and R.sup.2, which can be the same or different, represent aliphatic groups, R.sup.3 represents a hydrogen atom, an aliphatic group, an aryl group or an aralkyl group, X represents --O-- or --NH--, M represents a cation and X and R.sup.3 may linked to each other to form a cyclic amino group.