Eco-friendly flexographic ink for anti-counterfeiting
The challenge to prevent the counterfeiting of documents is a research area that demands innovative techniques. A new study reports the use of fluorene-based Schiff base (FBH) prepared via a simple, one-step and cost-effective method as a thermally stable and biocompatible pigment for environment-friendly, water-based flexographic ink for potential application in security printing.
The flexo ink coating and print on the UV dull security paper were invisible in the daylight but displayed bluish-green fluorescence under UV light. The functional ink formulation can also be smartly-utilised in stamp/ink pads to obtain invisible fingerprint for detecting forgery.
The study has been published in Progress in Organic Coatings, Volume 161, December 2021.