A method of representing crytographic values in text form is described. The inventive blends are useful for packaging, and exhibit improved oxygen-scavenging activity and lower haze compared with blends made using polyethylene terephthalate polymers prepared with antimony catalyst and either the olefinic or the polyamide homopolymers or copolymers, individually. As the etchant in the recirculating path flows through the porous filter, the silicon nitride on the porous filter dissolves into the etchant. One outer core layer can be a water vapor barrier layer to protect the ball from water vapor encroachment, which reduces the performance of the ball.