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How to authenticate a wet signature.
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Martin Brown[_2_]
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How to authenticate a wet signature.
On 25/01/2018 09:25,
wrote:
On Wednesday, 24 January 2018 23:14:10 UTC, ss wrote:
I have 3 `copies` of a document.
1 is original (ball point) and 2 are copies (laser printer)
They all look similar, so does anyone know of a way to differentiate the
`wet signature` from the copies.
Have a look for yellow dots using visible blue lights
https://en.wikipedia.org/wiki/Printer_steganography
http://seeingyellow.com/
Includes links to websites which can help you decode the dots
Your are right. That is by far the easiest non-destructive test.
A 10x loupe easily sees the printer forensic yellow dots in good light.
They are all but invisible under a 3x loupe without using blue light.
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Regards,
Martin Brown
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