New luminescent ink promises advanced anti-counterfeit measures for currency, goods

Scientists introduce innovative ink with colour-changing security features to curb counterfeiting in currency, certificates, and products.

A breakthrough against counterfeiting

In response to the global rise in counterfeiting, scientists from the Institute of Nano Science and Technology (INST), under the Department of Science and Technology, have developed a security ink that uses luminescent nanomaterials with rare earth doping. This ink exhibits unique colour changes under different light sources, creating a more secure means of authentication.

How the ink works

The ink displays various colours when exposed to specific light wavelengths: vibrant blue under 365 nm light, pink under 395 nm, and orange-red under 980 nm near-infrared (NIR) light. Unlike traditional UV-only covert tags, this multi-wavelength response offers enhanced protection against duplication.

Synthesizing the ink

Developed through a co-precipitation method at 120°C, the luminescent nanomaterials are blended into PVC ink using sonication. These inks are then printed onto items using screen-printing techniques, with visible colour shifts when exposed to light.

Potential to curb counterfeiting

With applications for currency, certificates, medicines, and branded products, this luminescent ink is expected to make verifying the authenticity of items simpler for consumers and manufacturers alike. It serves as an accessible and effective tool to detect counterfeits, offering improved encryption and durability across various conditions.