Abstract: A photolithographic receptor sheet for silver diffusion transfer imaging comprising a support with a hydrophilic layer thereon consisting essentially of colloidal silica and a defined dry hydrophilic powder, and a catalytic silver precipitating nuclei layer thereover. The imaged construction is useful as a lithographic printing plate.

Abstract: A lithographic type diffusion transfer developing composition which provides high contrast images having sharp toe-gradation for developing silver halide light-sensitive materials contains at least one amine represented by one of the following general formulae (I), (II) or (III):H.sub.2 N-C.sub.n H.sub.2n -X (I) ##STR1## X, X', R.sub.1, n and m are defined in the specification. The process of developing using such a composition is also disclosed.

Abstract: Lithographic printing plates having high ink receptivity, suffuring no ink stains and having much improved printing endurance can be produced by silver complex diffusion transfer process from lithographic printing plate materials comprising a support having thereon at least both silver halide emulsion layer and physical development nuclei layer wherein the diffusion transfer processing is carried out in the presence of 2-mercaptobenzoic acid derivatives or, besides this 2-mercaptobenzoic acid derivatives, at least one compound selected from the group consisting of alkanolamines and cyclic imide compounds which may be contained in at least one layers of the lithographic printing plate materials and/or the diffusion transfer developing solutions.

Abstract: In production of lithographic printing plates by developing a photographic material comprising a support having thereon at least both silver halide emulsion layer and physical development nuclei layer by silver complex diffusion transfer process to form transfer silver to be used as ink-receptive portions of the lithographic printing plates, when the development is carried out in the presence of a cyclic imide compound (alone or in combination with sulfites, thiosulfates, thiocyanates or alkanolamines) as defined hereinafter, ink-receptivity of the transfer silver image portions and printing endurance of thus obtained printing plates are improved. Moreover, the non-image portions have no or substantially no stains.

Abstract: A novel process for producing a polymeric image, which comprises the steps of:(1) treating an image-wise light-exposed layer of a photographic silver halide emulsion with a treating solution having a reducing capacity, said treating solution having a capacity for initiating the polymerization of an addition-polymerizable unsaturated compound and a capacity for reducing the silver halide into metallic silver and having a property that it loses said capacity for initiating the polymerization once it is used for the reduction of the silver halide;(2) transferring or diffusing said treating solution from the silver halide emulsion layer into a layer of an addition-polymerizable material, providing polymerized portions and unpolymerized portions; and(3) removing the unpolymerized portions.

Abstract: A photographic material for reproduction especially of continuous tone originals by the silver complex diffusion transfer process comprising in order:(1) a silver halide emulsion layer,(2) a layer reflecting white light having a dry coating weight in the range of 5 g/sq.m to 20 g/sq.m and dispersed in an organic hydrophilic colloid binder white inorganic pigment particles in such an amount that such layer has a diffuse transmission density of 0.30 to 0.50 and a reflection density of 0.15 to 0.20,(3) a subbing layer,(4) a hydrophobic transparent film support,(5) a subbing layer, and(6) an antihalation layer having a dry coating weight in the range of 4 g/sq.m to 15 g/sq.m and containing dispersed in an organic hydrophilic colloid binder a non-bleachable black antihalation material in such an amount that such layer has a diffuse transmission density of at least 2.

Abstract: A lithographic printing plate which utilizes a photographic process and which is excellent in ink-repellency of non-image areas, have no stains with oily materials or fingerprints of workers, shows no reduction of ink-repellency of non-image areas and ink-receptivity of image areas with the lapse of time and can provide prints with no stains and clear images is produced by a neutralizing solution used in photographic treatment containing colloidal fine particles, preferably in combination with a hygroscopic polyol compound.

Abstract: A photolithographic plate, method for preparation thereof, and salt compound useful in the preparation, the method involving the treatment of a metallic silver image on a substrate with a homogeneously stable acidic aqueous salt solution comprising a ferricyanide anion for oxidizing the metallic silver and an organic cation capable of forming a water-insoluble, inherently oleophilic complex with oxidized silver, the cation being derived from a protonatable nitrogen-substituted hydrocarbon compound containing a formal imine group therein which is in resonant association with adjacent groups within the hydrocarbon compound.

Abstract: An aqueous acidic etch-bleach solution comprising hydrogen peroxide, iron(III)ions and inorganic anions that form a silver salt having a solubility product not greater than 1.times.10.sup.-8 determined in water at 20.degree. C., characterized in that such solution contains in the dissolved state the combination of citric acid and a polymer containing alkylene oxide units for improved stabilization of the hydrogen peroxide.