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Cumming's invisible 'ink'
2010-Sep-21, Tuesday 22:55The jokes write themselves for this one:
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".The first head of Mi6, called Cumming, got his agents to use semen as a form of invisible ink.
In October he noted that he "heard from C that the best invisible ink is semen"
