We've got some news to report direct from the United Kingdom's most venerable, high-brow, elite newspaper, The Sun. According to their sources, hard-working semen was instrumental in covert MI6 operations:
SEMEN USED AS INVISIBLE INK
James Bond didn't waste all his spunk on slinky dames. Some of it was used to defend The Empire.
I'm not sure if this story is even true. This is from The Sun, after all. (Which I shamefully loved reading when I lived in London. It's a bit like the NY Post: odious yet very addictive.)
But I can tell this journalist had an excellent time writing this jizz-filled historical account:
Walter Kirke wrote in June 1915 that Mansfield Cumming, the first chief of the SIS, was "making enquiries for invisible inks at the London University". In October he noted that he "heard from C that the best invisible ink is semen", which did not react to usual methods of detection.
It also had the advantage of being easily available.
One member of staff close to Cumming, Frank Stagg, said he would never forget his bosses' delight when the Deputy Chief Censor said one of his staff had discovered that "semen would not react to iodine vapour".
Close to Cumming, indeed.