Lithographic Reproduction Directly from Xerographic Plates.

Major advancements have been made in the preparation of Iithographic plates by xerography. This paper describes and illustrates one of these advances--the development of a practical process for using the xerographic plate itself as a lithographic printing surface. Today, good lithographic plates can be prepared of both line subjects and halftone subjects, and it is no longer necessary to transfer the xerographic image from the xerographic plate to a lithographic printing surface. In this process, xerographic images are prepared and fixed directly on a special type of xerographic plate, and the nonimage areas of the xerographic plate are then made water receptive. The resulting lithographic plate is placed on a conventional offset lithographic press and prints are prepared by conventional lithographic procedures. Research is continuing, with emphasis on devising technique for halftoning images directly on the xerographic plate in a process camera.