There is described a method of manufacturing a security article, said method comprising the steps of: introducing into a printing device a discrete sheet of transparent film comprising a non-fibrous substrate layer of regenerated cellulose; disposing an opacification layer on at least a portion of at least one surface of said film by a first printing step; and disposing printed information on at least a portion of said opacification layer by a second printing step wherein said second printing step is an offset printing step.