Peel-apart-developable light-sensitive materials and image-forming method using the same

A method for forming images which consists of imagewise exposing through an original for a period of about 0.1 seconds to about 60 seconds a light-sensitive element (a) to actinic radiation, said light-sensitive element (a) comprising (i) a first support having coated thereon (ii) a thin layer of a metal or a metal alloy and (iii) a light sensitive composition layer which comprises as a binder at least one organic high molecular weight material having a glass transition temperature of about 110.degree. C. or less selected from the group consisting of polyvinyl acetate, polyvinyl chloride and polyethylene oxide and, as a light-sensitive compound, at least one aromatic azido compound in this order, wherein said actinic radiation decomposes said azido compound;

• laminating said imagewise exposed light-sensitive element (a) with an adhesive element (b) comprising (i) a second support having coated thereon (ii) an adhesive composition layer having a thickness of about 0.5 .mu.m to about 50 .mu.m, so that the light-sensitive composition layer (iii) of said imagewise exposed light-sensitive element (a) and the adhesive composition layer (ii) of said adhesive element (b) are adjacent each other;
• heating the product of said laminating to about 100.degree. C. to about 120.degree. C. for 2 minutes or less and then peeling apart, after the product has cooled to room temperature, one of said first support (i) or said second support (ii) from the product whereby a positive opaque metal or metal alloy image of said original is formed on said first support (i) and a negative opaque metal or metal alloy image of said original is formed on said light-sensitive composition layer (iii) said second support, where at least one of said first support and said second support is flexible and functions as the support which peels apart from said product.