Hairlines on banknotes

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Hi, what causes this on many banknotes?:

I think some notes are not just made or paper, some also
have fabric fibres in - maybe to strengthen the note.
Token collector [1600-1899] with some coins
Yes, here is a page with information, about half way down ...
https://en.wikipedia.org/wiki/Banknote
Token collector [1600-1899] with some coins
Those are silk strands a security feature.

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