Banknote validator [opgelost]

Has anyone any knowledge on how good these are for detecting watermarks on notgeld notes

Hello 🤖

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muzz0000

Has anyone any knowledge on how good these are for detecting watermarks on notgeld notes

This is just a UV lamp, how would you see the watermark? Just use a pane of glass or polymer with a light source behind it.

Or something like THIS.

Thanks for

that I will see if I can find one

I use a flatbed scanner, it has a transparency function for scanning film negatives. It shows up the security strip, the watermark and any cornerstone watermarks also.

On this polymer note, the scanner picked up some fish that only appear under backlight: