Spontaneously generated, random wrinkles of coatings on microscale particles have been found to be analogous to fingerprints — unique patterns with a wavy topography that can serve as unclonable tags for anti-counterfeiting purposes.
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Yin, J., Boyce, M. Unique wrinkles as identity tags. Nature 520, 164–165 (2015). https://doi.org/10.1038/nature14380
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DOI: https://doi.org/10.1038/nature14380
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