Invisible (QR) codes designed to tackle the issue of counterfeit goods

[bobito]

Through a process known as upconversion, the codes are created from tiny nanoparticles, combined with blue and green fluorescence ink. The nanoparticles absorb photons at a non-visible wavelength but emit them in a visible wavelength.






The Quick Response (QR) codes are more often used in the advertising industry to allow customers view product details and other relavant information. The code's complexity means they are hard to replicate.

The researchers who designed the QR codes intended as a means of authentication rather than information.







ref:bbc