A virtually transparent magnetic layer is included as an additional layer in a color negative film. Information exchange between various users of the film--such as the camera user, the dealer and photofinisher--is carried via plural longitudinal magnetic tracks on the film, each track being dedicated...http://www.google.de/patents/US4965626?utm_source=gb-gplus-sharePatent US4965626 - Printing and makeover process for magnetically encodable film with dedicated magnetic tracks
