22-09-2010, 12:00 AM
MI6 'used bodily fluids as invisible ink' 21 Sep 2010 British intelligence services experimented with using semen as an invisible ink to write top-secret letters, it has been disclosed. A diary entry belonging to a senior member of the Secret Intelligence Service (MI6) has revealed that during the First World War it was discovered that the bodily fluid could act as an effective invisible ink. 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".
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