News Coatings Technologies
Fluorene–Bithiophene fluorophore advances forensic and security ink applications
A novel fluorophore based on fluorene–bithiophene architecture enables high-resolution latent print visualization and multifunctional eco-friendly security inks with dual-mode anti-counterfeiting capabilities.
Latent finger and lip prints are critical forensic evidence due to their uniqueness, yet reliably visualising them on diverse surfaces remains a challenge. Concurrently, increasing counterfeit threats demand innovative security materials for protecting brands, consumers, and economies. A recent study introduces a multifunctional fluorophore, BTAF, based on a conjugated fluorene–bithiophene architecture, addressing both forensic and security needs.
BTAF combines the photostability and rigidity of fluorene with the electron-rich nature of bithiophene, delivering red-shifted solid-state fluorescence with high quantum yield. The molecule exhibited exceptional performance in visualising intricate latent prints, enabling both qualitative and quantitative analysis across different substrates. Interaction studies using molecular dynamics simulations and FTIR analysis revealed effective binding with glycine and myristic acid, compounds commonly found in latent prints, enhancing detection capabilities.
Reading tip: Additives for water-borne coatings
Water-borne systems are the coatings of the future. The market is developing an insatiable appetite for ecologically sound coatings based on renewable raw materials. The demands on coating performance are at least as high as those on environmental compatibility. Additives help to protect the environment by effectively reducing the use of organic solvents. Many of today’s water-borne coatings could not be formulated without them. When incorporated into water-borne paints, coatings and printing inks, they enhance both the production process and the performance of the applied inks and coating materials. “”Additives for Water-borne Coatings“” is a must read for formulators wishing to brush up on water-borne coating systems, as well as experts seeking to have detailed knowledge at their finger tips.”
Smart inks for advanced security
In addition to forensic applications, BTAF has been successfully integrated into eco-friendly security inks compatible with offset printing systems. These inks exhibit reversible dual-mode responses, transitioning from magenta to yellow under daylight when heated above 31 °C, while maintaining green fluorescence under UV light at 380 nm. This dynamic behaviour enhances anti-counterfeiting measures through multi-level security features.
With its facile synthesis, low toxicity, and multifunctional performance, BTAF represents a promising material for future forensic tools and security printing technologies, addressing global challenges in counterfeit prevention and evidence visualisation.
Source: Jain, R. K. et al., Multifunctional fluorophore based on fluorene–bithiophene architecture for latent print visualization and stimuli-responsive eco-friendly security inks. Progress in Organic Coatings, 213, 109995 (2026).
