Abstract: A method for adding authentication features to a barcode is described. The barcode includes a plurality of printed parallel bars and the method includes embedding printed security features within the printed barcode. The parallel bars of the bar code are of varying width and at least one of the parallel bars has security features printed within that are printed in a color that is different than a color of the parallel bars.

Abstract: Thermally stable, solvent resistant labels comprising a face stock made of a high temperature resistant polymeric film having a print-receptive coating on its top surface, a curable, pressure-sensitive elastomeric adhesive containing at least one polymer having an acrylonitrile unit in the polymer chain and at least one phenolic resin applied to the bottom surface of the face stock, and a silicone release medium coated carrier liner releasably bonded to the elastomeric adhesive. When applied to a substrate, the labels adhere to the substrate, have minimum flow characteristics, maintain printed matter legibility and optical scannability after being heated to a temperature of less than about 600.degree. F. and immersion in chemical baths of halogenated organic solvent solutions for periods as long as 10 minutes. Printed matter may be impressed upon the print-receptive coating of the label. Methods of producing and curing thermally stable, solvent resistant labels are also disclosed.