SJH IR infrared ink test: stable infrared absorption and excitation characteristics, machine-readable - for banknotes, ID documents, security documents and cigarette packs.
A full written description of the demonstration, so the content is readable without playing the video.
This video demonstrates SJH IR infrared ink: stable infrared absorption and excitation characteristics that inspection equipment can read - machine-readable security for banknotes, documents and securities.
The video first shows the IR ink print under ordinary light. IR inks fall into two families: infrared-absorbing, which absorb in the IR region (appearing dark under IR light and read as black by equipment), and infrared-excited, which emit under IR excitation. Both can be read reliably by inspection equipment.
The camera shows the response of the sample under IR conditions. The key quality measure for IR ink is signal-to-noise ratio - the difference in IR response between the feature area and the base paper or other printed areas. The higher the ratio, the more stable the equipment reading and the lower the false-read rate, which is what determines whether automated authentication is viable.
IR security demands very high batch consistency: IR response must stay within an acceptable range between sheets in a batch and between batches, otherwise inspection equipment misreads. This is exactly why IR ink is common in banknotes and documents - it requires a strict quality control system, and cannot be achieved by the ink alone.
| Types | Infrared-absorbing / infrared-excited, both readable by inspection equipment |
|---|---|
| Key metric | Signal-to-noise ratio between feature and background determines reading stability |
| Key requirement | Batch consistency with strict QC, or equipment misreads |
| Typical use | Banknotes, ID documents, securities, cigarette packs - high-grade machine-readable security |
The value of IR ink is not visual appearance but stable machine readability. It suits large-scale users that already have an IR inspection step; without matching equipment on the line, IR ink alone does not close the security loop. When specifying, clarify three things together: the light source type of the inspection equipment, the reading method, and the acceptable false-read rate - we can match the ink formula and batch control accordingly.
Selection, detection, printing and ordering — answered.