| abstract |
A method of making an identifiable article such as a container (124) or container preform (24). A molded plastic container or container preform is provided that includes a wall having at least one layer of matrix resin (38, 40) and at least one layer of barrier resin (42) that is blended with an additive. The wall has at least one localized portion (34) of predetermined geometry in which the barrier layer (42) is thicker than surrounding portions of the wall, and within which the additive is discernable under visible or UV light so as to provide a means to prevent use of counterfeit containers. |