A photoconductive member (11) has a conductive substrate (11a) on which is formed a first photoconductive layer (11b) which is insensitive to red light but sensitive to at least one other color component of white light and a second photoconductive layer (11c) formed on the first layer (11b) which is...http://www.google.de/patents/US4310610?utm_source=gb-gplus-sharePatent US4310610 - Two color electrostatographic process
