Nanoparticles are particles between 1 and 100 nanometers in size. They can be engineered to have specific properties, such as fluorescence or magnetism. In anti-counterfeiting, nanoparticles can be mixed into inks and applied to items like banknotes, passports, or product packaging. Under specific conditions, such as ultraviolet light, these nanoparticles exhibit unique properties that can be easily verified but are extremely difficult to counterfeit.
