SJH UV dual-band security ink test: the same print shows different fluorescence colors under 365nm and 254nm UV light - one ink, two security features for cigarette packs and ID documents.
A full written description of the demonstration, so the content is readable without playing the video.
This video demonstrates SJH UV dual-band security ink: the same print layer shows different fluorescence responses under a 365nm long-wave UV lamp and a 254nm short-wave UV lamp - two security features in one ink.
The video opens with the printed sample under normal indoor lighting. The ink layer is invisible and the sample looks like any conventional print - the basic property of covert fluorescent ink: it does not show or alter the packaging design under daylight or indoor lighting, so the security feature stays hidden in plain sight.
The camera switches to a 365nm long-wave UV lamp and the ink layer is excited into bright fluorescence, revealing the pattern clearly. Long-wave UV is the most widely used inspection method in security printing: handheld banknote detectors and most commercial UV inspection devices operate at 365nm, making this the lowest-barrier, most verifiable layer.
Switching again to a 254nm short-wave UV lamp, the same ink layer shows a different fluorescence response from the long-wave result. Short-wave UV penetrates less deeply and is more sensitive to the ink surface, and most ordinary fluorescent materials respond weakly or not at all at 254nm - so a dual-band response is itself a high-barrier feature.
| Excitation | 365nm long-wave and 254nm short-wave UV, dual-band response |
|---|---|
| Effect | Invisible in visible light, two distinct fluorescences - two verifiable features |
| Verification | Checkable on site with a handheld UV lamp, no instrument or database needed |
| Typical use | Cigarette packs, ID documents, security tickets and similar high-grade applications |
The security logic of dual-band ink lies in reproduction cost: a counterfeiter must match the fluorescence response at two wavelengths accurately, far harder and costlier than single-band fluorescent ink, while the printer still needs only one printing pass and one process step. Where high-grade covert security and undisturbed design are both required, dual-band is the most cost-effective option.
Selection, detection, printing and ordering — answered.