By Sean Coughlin In a 2015 episode of Turn, a US Revolutionary War TV drama on AMC, George Washington’s spy Abraham Woodhull uses a special ink made with alum to write secret messages under the shells of hard-boiled eggs. The technique was also advertised on the show’s Twitter in 2014, a year before the episode aired (Figure 1). Figure 1: Teaser tweet before the airing of the episode. Image via AMC Twitter. Hardboiled eggs have double the use now. #TURN #Spycraft pic.twitter.com/Cw0j8dPAyx — Turn …
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