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Before the invention of envelopes, people would secure their handwritten letters with a curiously complex craft. Welcome to the world of letterlocking!

Secrets of 'locked' letters revealed Virtual technique was developed to open specially folded letters without damaging their historical contents.  By William J. Broad New York Times March 11, 2021 — 10:02pm Text size Copy shortlink: In 1587, hours before her beheading, Mary, Queen of Scots, sent a letter to her...

Scientists read 300-year-old sealed letter without opening it "Virtual unfolding" allows researchers to look inside intricately folded historical letters without damaging them. Scientists are using technology to read centuries-old letters sealed using "letterlocking." Nature Communications In a letter, dated July 31, 1697, Jacques Sennacques asks his cousin Pierre Le Pers, a French merchant in The Hague, for a certified copy of a death notice for Daniel Le Pers. That's no revelatory request by any means, but for the past 300 years, the lette...

Scientists read 300-year-old letters without opening them • 7 min read Catch up on the developing stories making headlines.STOCK/Getty Images Unopened letters more than 300 years old that were folded using mysterious techniques have now been read for the first time without opening them, a new study finds. For centuries, before mass-produced envelopes started proliferating in the 1830s, most letters across the globe were sent using letterlocking, a method of folding letters to become their own envelopes. These intricate techniques also often served to help recipients detect if mail had been ...

Updated: The team used a technique called X-ray microtomography Share Article AAA Computer-generated unfolding sequence of sealed letter DB-1538. Courtesy of the Unlocking History Research Group archive. The letters are from the Brienne Collection, Sound and Vision The Hague, The Netherlands.   The team used a technique called X-ray microtomography (Subscribe to Science For All, our weekly newsletter, where we aim to take the jargon out of science and put the fun in. Click here.) In 1926, a seventeenth-century trunk containing over 2000 unclaimed letters was bequeathed to the Dutch postal m...