Since Glaxo (North Carolina) first used a tamper-evident hologram to seal packs of Zantac in 1989, holograms have been taken up in a big way by industry. Many major drug companies use holograms on at least some of their medicines in the form of labels, seals, hot-stamped patches, and blister-foils. The ability of the hologram to provide effective protection lies in the continuous innovation, invention, and evolution in holographic techniques that have succeeded in creating increasingly complex devices that are easily recognized yet difficult to copy accurately.
The evolving role of the hologram has also been accompanied by increased use of the security device in combination with other authentication technologies. In such solutions, holograms can provide overt first-line authentication while covert features such as scrambled images, microtext, UV-sensitive or other specialist inks provide second line authentication for trained examiners and appropriate decoding equipment.Another recent trend is the serialization of holograms as part of systems that combine authentication with traceability. These "track-and-trace" systems link on-pack security devices with database management and field-tracking services. Manufacturers are able to tell where a pharmaceuticals consignment has been, where it's located, and where it's headed. This is particularly important in identifying the source and provenance of products.
While US Congress is currently considering making the use of security-marking on some pharmaceutical products mandatory using "overt optically variable counterfeit-resistant technologies" to protect consumers from fakes, the hologram is already specified as the authentication feature on the world's only statutory pharmaceutical marking scheme: the Meditag program in Malaysia. This program requires all registered medicines, over-the-counter pharmaceuticals, and traditional medicines to carry a uniquely numbered label built around a hologram. More recently, Nigeria's National Agency for Food & Drug Administration and Control has announced plans to introduce uniquely numbered holographic labels on all licensed medicines distributed in the country.
Perhaps unsurprisingly, the success and near ubiquitous use of holograms in anticounterfeiting applications has inevitably led to attempts to copy or replicate them. The intrinsic features of holograms, however, are very difficult to copy with 100% accuracy which makes them a preferred detection feature for packaging.
It is important to note, however, that it is the primary responsibility of manufacturers and regulators to ensure that fake pharmaceuticals not be able to enter the legitimate supply chain. A case in point occurred in Southeast Asia where it has been reported that more than half the sales of the antimalaria treatment Artesunate were for counterfeit versions despite the drug's blister-pack that contained a hologram. The point is, although regulators can identify fake holograms, the public cannot necessarily do so. Going forward, holograms will continue to evolve and for the time being, remain an integral part of anticounterfeiting strategies.
Ian Lancaster is general secretary at the International Hologram Manufacturers Association.