BLACK ELECTROCHROMIC IMAGING
Original Publication Date: 1981-Feb-28
Included in the Prior Art Database: 2004-Apr-02
Xerox Disclosure Journal
A method of imaging using an electrochromic material produces a black image which may be formed on or transferred to a copy material. The method involves using an electrochromic material which comprises a solution in methanol of N, N' di(p-cyanopheny1) - 4, 4' bipyridylium dichloride, and passing electric currents in image configuration at a potential above a threshold potential for black coloration of the reduced electrochromic material. The electric current may conveniently be passed in two parts, the first comprising brief pulses at a potential above the coloration threshold, and the second comprising a DC potential less than the threshold potential.