An electro-optical device containing an electrochromic material layer and electrolytic solution interposed between mutually opposed base plates, each having an electrode on the surface thereof, wherein said electrolytic solution consists essentially of (a) an iodide source material as a redox reaction...http://www.google.se/patents/US4671619?utm_source=gb-gplus-sharePatent US4671619 - Electro-optic device
