Identity documents are built to be read in more than one way. The security features printed into a passport or an ID card are not decoration. Each one answers a different question, and each one only answers it under the right light. A check that looks at a document in ordinary light is reading one page of a three-page answer.
Why a photo of a document is not enough
A camera photograph shows a document the way it looks. Document security is designed around the way it behaves: inks that fluoresce, fibres that only appear under UV, fields that disappear in infrared. None of that behaviour exists in an ordinary photo, which is why a check built on one image in white light cannot see what the issuer put there to be checked.
That is why verification starts with capture rather than with software. The Forensic Scanner photographs every document three times, at 900 DPI, and the cloud models receive all three before they look at anything.
Visible light: what the eye already sees
Under white light the scanner reads what a person at the counter reads: the photograph, the printed data, the layout, the fonts. At 900 DPI it also reads what a person cannot: the microtext that looks like a line until it is magnified, the fine lines of the guilloché background, the exact edges of each printed character.
Most crude forgeries fail here. A document reprinted on an office printer loses its microtext, blurs its guilloché and shifts its fonts by fractions of a millimetre. None of that is visible across a desk. All of it is visible at 900 DPI.
Ultraviolet: what the printer could not copy
Genuine documents carry inks and fibres that only appear under ultraviolet light, and a paper base that stays dark around them. Under UV, a genuine page lights up in a pattern the issuing authority designed. A page printed on ordinary paper glows almost uniformly, because the brighteners in commercial paper react to UV everywhere at once.
This is one of the oldest checks in document examination, and one of the hardest to fake, because the forger has to reproduce both what glows and what does not.
Infrared: what the inks are made of
Some inks absorb infrared light and some let it pass. Two printed areas that look identical in visible light can separate completely in infrared, because they were printed with different inks. Issuers use this deliberately: certain fields are printed so that they vanish or appear under IR.
Infrared is also where alterations show. A date that was changed, a digit that was scraped and reprinted, a photograph laid over another one: the new material rarely behaves like the original under IR.
Why all three, and why together
Each light alone can be fooled by a forger who studied that one light. A forgery that passes in visible light still has to glow correctly under UV and absorb correctly in infrared, on the same page, in the same places. That combination is what a forgery cannot survive.
- Visible: microtext, guilloché, layout and print quality at 900 DPI.
- Ultraviolet: security inks and fibres against a paper base that should stay dark.
- Infrared: ink composition, and the traces left by alterations.
From three images to one answer
The three captures travel encrypted to the cloud, where they are checked against hundreds of AI models trained on the document type and country in question. What comes back is one clear verdict, accept or escalate, in under 7 seconds.
The same examination by a trained agent takes 3 to 5 minutes, and depends on the agent having a UV lamp, knowing where to look and not being in a hurry. The scanner removes all three conditions without removing the examination.
Questions about multi-light document checks
Why can a phone not do the same examination?
A phone has a white flash and a camera tuned to visible light. It cannot light a document in ultraviolet or read it in infrared, which is why remote checks lean on the chip and on liveness, and why the counter uses a scanner built for all three lights.
What resolution does the scanner capture at?
900 DPI, in each of the three lights. That is what makes microtext and guilloché lines readable instead of blurred into a line.
Which documents can it read?
Passports, ID cards and other identity documents from more than 200 countries, each checked against the references for its type and country.
How long does the check take?
Under 7 seconds for the verdict, against 3 to 5 minutes for the same examination done by a trained agent with a UV lamp.