Abstract: A metal image-forming material comprising a base, a photosensitive resin layer formed thereon, and a layer of an aluminum/iron alloy formed between the base and the resin layer. The aluminum/iron alloy layer has superior etchability, and the image-forming material affords images having high contrast and resolving power. The image-forming material is especially suitable for linework and dot etching.

Abstract: A light-sensitive lithographic printing plate comprising a support and a layer of a light-sensitive composition thereon consisting of a light-sensitive polymer containing a --CH.dbd.CHCO-- unit in its main chain and a light-sensitive polymer containing a --CH.dbd.CHCO-- unit in its side chain(s).

Abstract: A photopolymerizable composition comprising a polymerizable ethylenically unsaturated compound, optionally, a linear organic polymer, and a photopolymerization initiator comprising a combination of a compound represented by the general formula (I) ##STR1## wherein Z represents the non-metal atomic group necessary to form a nitrogen containing heterocyclic nucleus, R.sub.1 represents an alkyl group or a substituted alkyl group, and R.sub.2 represents an alkyl group or an aryl group having a comparatively high photopolymerization initiating ability; and a compound represented by the general formula (II) ##STR2## wherein X represents a halogen atom, Y represents --CX.sub.3, --NH.sub.2, --NHR.sup.1, --NR.sup.1.sub.2 or OR.sup.1, R.sup.1 represents an alkyl group or an aryl group and R represents an alkyl group, an alkyl group substituted with at least one chlorine atom, an aryl group, a substituted aryl group or a substituted alkenyl group.

Abstract: A photosensitive printing plate with high sensitivity comprising a support having a hydrophilic surface and formed in succession thereon (1) a layer of an oleophilic photosensitive resin composition whose solubility in a solvent is changed by exposure to light to which the resin composition layer is sensitive and (2) directly on the layer (1) a layer containing a dispersion of particles of photosensitive silver halide grains coated with a water-soluble polymer in an oleophilic polymer capable of being dissolved in a developer for the photosensitive resin composition.

Abstract: A processing solution useful for the development of or halftone dot reduction of a metal image-forming material comprising a support, a thin metallic layer composed mainly of aluminum on the support and a photosensitive resin layer on the metallic layer, with the processing solution comprising (1) an alkaline solution, such as an aqueous solution of sodium hydroxide or potassium hydroxide, and (2) at least one compound of the formula (I) or (II):m(brO.sub.3).sub.p (I)m.sub.m (IO.sub.n).sub.p (II)wherein M represents a hydrogen atom or a metal having a valence of 1 to 3, m represents 1, 2, 3, or 5, n represents 3, 4, or 6, and p represents 1, 2 or 3, which solution lends itself to safe storage and handling, and permits rapid and uniform etching of the metallic layer of the metal image-forming material without bubble formation occurring.

Abstract: A metallic image forming article comprising a support, an intermediate layer comprising Al and a metal having an ionizing tendency lower than that of Al, and a photosensitive resin layer on the intermediate layer.