Researchers Advance Optical Fingerprinting for Authentication

Researchers at the University of Adelaide have developed a laser-based optical fingerprinting technology that identifies counterfeit alcohol and hazardous chemicals through sealed bottles, providing a rapid, non-destructive method for product authentication and safety. This advancement builds on collaborative research between the University of St Andrews and the University of Adelaide.

The study showed that a specially designed laser system can detect toxic methanol in unopened spirit bottles, even when the bottles are made from coloured glass.

The technology uses Raman spectroscopy to measure the unique molecular ‘fingerprint’ of a liquid through its packaging. By combining advanced laser beam shaping with wavelength modulation, they improved sensitivity and reduced interference from packaging materials. The system detects methanol at concentrations about ten times lower than internationally recognised safety limits, offering an efficient alternative to conventional laboratory testing without opening the container.