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Me: In June 1915, Walter Kirke, deputy head of military intelligence at GHQ France, wrote in his diary that Mansfield Cumming, the first chief (or C) of the SIS was “making enquiries for invisible inks at the London University.”
Me: what do you think Cumming was considering as an invisible ink
Me: hint: it is in his name
The Beau: i already knew that
Me: In October he noted that he “heard from C that the best invisible ink is semen”, which did not react to the main methods of detection. Furthermore it had the advantage of being readily available.
Me: that last sentence is my favourite
The Beau: every man his own biro

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