Espionage Techniques of Seventeenth-Century Women
February 16, 2016 8:29 AM Subscribe
While Dr. Nadine Akkerman of Leiden University was examining letters sent by Elizabeth Stuart, Queen of Bohemia (Google books preview) during her exile in the Hague, she discovered that some were filled with secret codes.... Akkerman was intrigued as to why the queen would require such covert correspondence. This was her first encounter with the 17th-century female spy.Within England, Dr. Akkerman uncovered a network of more than sixty female spies.
You can find a recipe of sorts for hiding messages inside eggs (and making invisible ink) from the period in Thomas Lupton's A Thousand Notable Things of Sundry Sorts, (Archive.org copy) "an assemblage of items without any sort of organization." That recipe was re-created in a video by the YouTube channel Letter Locking, which has a host of other interesting videos on invisible writing and letter locking (previously/recently).
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