A breath reveals a hidden image in anti-counterfeit drug labels

Terry Shyu, MSE PhD Student, demonstrates use of nanopillars that reveal hidden images via condensation of fluid on the structures. Image credit: Joseph Xu
Terry Shyu, MSE PhD Student, demonstrates use of nanopillars that reveal hidden images via condensation of fluid on the structures. Image credit: Joseph Xu
An outline of Marilyn Monroe’s iconic face appeared on the clear, plastic film when a researcher fogs it with her breath.

Terry Shyu, a doctoral student in chemical engineering at the University of Michigan, was demonstrating a new high-tech label for fighting drug counterfeiting. While the researchers don’t envision movie stars on medicine bottles, but they used Monroe’s image to prove their concept.

Counterfeit drugs, which at best contain wrong doses and at worst are toxic, are thought to kill more than 700,000 people per year. While less than 1 percent of the U.S. pharmaceuticals market is believed to be counterfeit, it is a huge problem in the developing world where as much as a third of the available medicine is fake.

To fight back against these and other forms of counterfeiting, researchers at U-M and in South Korea have developed a way to make labels that change when you breathe on them, revealing a hidden image.

“One challenge in fighting counterfeiting is the need to stay ahead of the counterfeiters,” said Nicholas Kotov, the Joseph B. and Florence V. Cejka Professor of Chemical Engineering who led the Michigan effort.

The method requires access to sophisticated equipment that can create very tiny features, roughly 500 times smaller than the width of a human hair. But once the template is made, labels can be printed in large rolls at a cost of roughly one dollar per square inch. That’s cheap enough for companies to use in protecting the reputation of their products—and potentially the safety of their consumers.

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