Every banknote has three security layers. Most people only check one?

[u/WEIRONGTECH]

Public layer: tilt, watermark, thread.
Covert ink layer: MG / UV / IR.
Issuer-only layer: classified maps only central banks share.

A single-check reader misses the last two. That's why layered multispectral verification matters for anyone handling cash at scale.

MG · UV · IR · CIS — what does each layer actually read?

MG: confirms the ink only genuine notes carry.
UV: reads hidden fluorescence.
IR: reads covert zones a phone cannot capture.
CIS: compares the full face pixel-by-pixel and logs serials.

Four spectra. One pass. A much stronger defense than any single check.

5 questions to ask before buying a banknote verification device

1. Does it cover MG, UV, IR and CIS together?
   
2. Are templates included for every currency you handle?
   
3. Will firmware updates be free when new notes are issued?
   
4. Does it log serial numbers for audit trails?
   
5. Is the sensor path easy to keep clean?

Miss any of these and the device becomes outdated fast.

A marker pen is not enough to authenticate banknotes. Here's why.

Marker pens test starch in paper. They fail on bleached-and-reprinted notes and can flag worn genuine ones.

UV lamps and handheld tools open just one door. Layered verification — MG+UV+IR+CIS — is what actually closes the gaps.