SJH IR excitation ink effect under IR light test: invisible under visible light, appears under IR lamp - for cigarette packs, banknotes and ID documents.
A full written description of the demonstration, so the content is readable without playing the video.
This video demonstrates SJH IR excitation ink: completely invisible under visible light, revealed under IR illumination - a machine-readable high-grade security feature.
The video opens with the printed sample under ordinary lighting; the ink layer is indistinguishable from the base paper and the pattern is entirely invisible. IR excitation ink contains no visible-wavelength colourant, so interference with the packaging design is zero - ideal for cigarette packs, wine labels and documents where design purity matters.
The camera switches to an infrared light source and the hidden pattern appears. Unlike UV fluorescent ink, infrared features are usually invisible or inconspicuous to the naked eye and require an IR detection device or dedicated lamp - making it a further step beyond UV fluorescence in covertness.
The video demonstrates how the IR feature is recognised by inspection equipment. The core advantage of IR security is machine readability: in-line inspection systems on a production line can read each sheet at high speed, enabling automated authentication and quality monitoring - something human-eye-dependent features cannot do.
| Covertness | Fully invisible under visible light, zero interference with design |
|---|---|
| Detection | IR light source or IR inspection equipment; usually not identifiable by eye |
| Key advantage | Machine-readable, supports high-speed in-line automated inspection |
| Typical use | Cigarette packs, security tickets, ID documents, securities and similar high-grade uses |
IR excitation ink represents automated security: it trades visual obviousness for machine readability and a very high imitation barrier, suiting large-scale users who already have in-line inspection equipment or need automated authentication. When choosing an IR solution, confirm the wavelength and reading method of the inspection equipment so the ink feature matches the existing line - best discussed with our technical team at the proofing stage.
Selection, detection, printing and ordering — answered.