William Pitt the Younger riding on the back of George III while surveying the French squadron, 1803. © Musee de la Ville de Paris, Musee Carnavalet, Paris / Bridgeman Images.
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Walter Kirke, British deputy head of military intelligence in France, noted in his diary in October 1915 that the chief (“C”) of the Secret Intelligence Service had come upon a solution for how to send secret messages: “Heard from C that the best invisible ink is semen,” Kirke wrote. The substance, it turned out, was hard to detect by the common revealing method of iodine vapor. The chief’s name: Mansfield Cumming.
Three may keep a secret, if two of them are dead.
—Benjamin Franklin, 1735
