PURPOSE: To obtain easily a large number of copies without the use of any ink, by a method in which an image is drilled by a discharge breaking method in the film layer of a copying material having a conductive coloring layer provided on a substrate and a film layer provided on the conductive coloring layer, and the copying material so treated is pressed on a medium to be duplicated.

CONSTITUTION: A conductive coloring layer consisting of a binder, a conductive substance, and a coloring agent on a substrate, e.g., paper or polyvinyl chloride film, in an amount of 30W130g/m2. The binder used includes various waxes, fatty acid amide compounds, e.g., stearamide, etc., and the conductive substance used includes carbon black, metal powders, etc., giving a surface specific resistivity of 102W105 ohm preferably. Then, on the conductive coloring layer, a plastic film layer in an amount of 0.5W10g/m2 is provided. An electric signal corresponding to an image is applied to the film layer of the copying material thus obtained to form a drilled image, and a sheet of paper, etc., is pressure contacted with the drilled image portion for copying.