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Let me know if there is a better community for this type of question. I am still learning my way around.

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[-] what@lemmy.world -4 points 1 year ago
[-] Akasazh@feddit.nl 1 points 1 year ago

Aside from the answers already given, the were ways of folding letters that were tamper proof, destructive in opening, called letter locking.

Here's an article on the prachtige: https://arstechnica.com/science/2021/03/locked-for-300-years-virtual-unfolding-has-now-revealed-this-letters-secrets/

this post was submitted on 19 Jul 2023
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