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Sealed letter mailed in 1697 finally opened by researchers virtually without tampering – Republic TV

Researchers have finally read an unopened letter that was mailed back in 1697 but was not delivered after developing a way to virtually “unfold” such letters.

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The researchers have finally read an unopened letter that was mailed back in 1697 but was not delivered after developing a way to virtually “unfold” sealed letter packets without actually breaking the seal. The new technique, called “letterlocking” has been described in the journal Nature Communications which is a practice of using elaborate slits, folds, creases and tucks to turn a flat sheet of paper with a written message into a tamper-resistant package. 
It is also believed that the new found…

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