the invention herein relates to a method and apparatus for forming an embossed blister from a laminated film wherein an indicia is formed on the base of the blister . in particular , the invention involves a single pass process of combining the formation of a blister and the formation of an indicia on the blister , wherein the blister - forming pin contains a face with an indicia and is adapted to controllably stretch the laminated film during blister formation to minimize stretching of the film at the base of the blister . the invention is particularly useful in manufacturing processes which involve the formation of blisters having laminated films which contain a metal foil and polymer layer , wherein improved control in the stretching of the laminate during blister formation is desirable .