Improvements relating to electrophotography.

摘要

A method of preprinting information, e.g. coordinate information, onto a sheet of unexposed electrophotographic material is disclosed. The method comprises either (a) depositing an image-forming layer on the electrophotographic material and generating the required preprinted information as an image in said layer, or (b) securing an image-bearing layer to the electrophotographic material. There is also disclosed a composite material which comprises an electrophotographic film which comprises a substrate (1; 4; 7; 11) and an image layer (2; 6; 8; 12) having superposed on one surface thereof a secondary, image-bearing or image-receiving layer (3; 5; 9; 13).