Image forming process by color intensification

A color image forming process for an image-wise exposed color photographic element comprising a support having coated thereon at least one photosensitive silver halide emulsion layer, and optionally at least one auxilliary non-photosensitive layer, including at least a color development and simultaneously or subsequent thereto an intensification, in the presence of a color former and a reducing agent which is oxidized and oxidatively coupled with the color former which comprises carrying out the intensification step in the presence of a peroxide intensifying agent and a compound having a polymerization degree of 1 to 8,000 represented by the following general formula in at least one of said photosensitive silver halide emulsion layer and said auxiliary non-photosensitive layer, if the latter layer is present;

• --(A).sub.x -- (B).sub.y --
• wherein A represents ##STR6## [or - (CH.sub.2 -CH.sub.2 -O)], wherein R represents ##STR7## [, or --OH];
• R.sub.1 represents an alkyl group of 1 to 6 carbon atoms;
• R.sup.2 represents a hydrogen atom or an alkyl group of 1 to 4 carbon atoms;
• and m represents an integer of 3 to 7;
• B represents a monomer unit induced from styrene, methacrylic acid ester, acrylic acid ester, vinyl acetate, acrylonitrile, vinyl alcohol, vinyl chloride, vinyl ether, acrylamide, N,N-dimethylacrylamide, acrylic acid, methacrylic acid, maleic acid, potassium styrene-sulfonate, N,N-dialkylaminoalkyl methacrylate, vinylimidazole or vinyl pyridine;
• and x and y represent mole percents;
• the sum of x and y being 100 mole percent and x being equal to or higher than 30 mole percent.