Two colour photocopying process - superimposes second image using opposite polarity on photosensitive layer in close contact with dielectric layer

摘要

The two colour copying process exposes a first original onto the photosensitive layer, held in close contact with a dielectric layer, using a set first potential. A second image is overlaid using an opposing polarity. The process then provides separate colours on overlapping regions, and a mixed colour on overlapping areas. The system combines data without a complex and repetitive process.