Every passport carries a drawing no copier reproduces cleanly: the guilloché.
It is one curve, traced by a small circle rolling inside a larger one. Change the ratio between them and the whole rosette changes — which is why the pattern is hard to forge and easy for a machine to check.
- Line geometry, measured against the reference pattern
- Ultraviolet and infrared response of the inks
- Chip data, matched to the printed page
Our readers run all three checks and answer in under two seconds.
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