a method of producing transparent indicia bearing plastic laminated identification cards , comprising storing individualized information on transparent or opaque sheets , or preferably , on a roll of microfilm , storing general information on a second transparent or opaque sheet or , preferably , on a slide displaying each of said portions of information , consecutively exposing adjacent frames of a roll of microfilm in a microfilm camera to each display by re - aiming , particularly by pivoting , said microfilm camera , developing said microfilm , and heat - sealing a pair of thermo - plastic sheets to surround the two frames of developed microfilm .