TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The oxygen sensitive indicator is of formula (Ru(L1)(L2)(L3))2+. The counter ions are selected from (PF6)-, Cl-, BF4-, Br-, and (C104)-, and platinum or palladium based metallo-porphyrin.Ru=central ruthenium ion;andL1, L2 and L3=bidentate ligands diphenylphenanthroline, phenanthroline or bipyridine ligands, or optionally substituted variations of same with representative counter ions.Preferred Structure: The structure (S1) further comprises at least one barrier layer.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The photostabilizer is selected from CIBA TINUVIN 5236 (RTM: photostabilizer), TINUVIN 292 (RTM: photostabilizer), TINUVIN 123 (RTM: photostabilizer), TINUVIN 272 (RTM: photostabilizer), TINUVIN 477W (RTM: photostabilizer), 1,4-diazabicyclo(2.2.2)octane, and ascorbic acid. The oxygen sensitive indicator and photostabilizer are incorporated by dissolving at least one oxygen sensitive indicator and at least one photostabilizer into at least one solvent; or by adding at least one oxygen sensitive indicator and at least one photostabilizer in powder form to at least one milled oxygen permeable polymeric material; or by incorporating an oxygen sensitive masterbatch into an oxygen permeable polymeric material, where the masterbatch consists of a carrier resin doped with at least one oxygen sensitive indicator and at least one photostabilizer. The oxygen permeable polymeric material is selected from polyolefins, vinyl resins, polyamides, polyurethanes, fluoroplastics and polydimethylsiloxanes. EXAMPLE - A mixture of ruthenium-tris(4,7-diphenyl-1,10-phenanthroline)dichloride (0.1 wt.% of an overall mixture) (1 g) and TINUVIN 5236 (RTM: photostabilizer) (0.05 g) was added to PPC 5660 (RTM: powdered polypropylene) (20 g). The polypropylene was pre-ground in a Wedco single stage grinding Mill. The mixture of powders was mixed in a Caccaia High Speed Turbomixer until homogeneity was achieved. The homogenous powder mixture was introduced to a small twin extruder/compounder at 210 degrees C to produce master batch pellets. These master batch pellets were incorporated into an oxygen permeable polymeric material to obtain an oxygen sensitive polymeric material.