Sperm can be used as invisible ink
During the First World War, members of the British Secret Intelligence Service made a discovery. that sperm did not react with iodine vapor (the main method for detecting invisible ink at the time). In addition, materials for ink production were at hand. The agents adopted the motto “every person has their own style.”
The diaries of a senior MI6 (Secret Intelligence Service) official have revealed that secretions from male genitalia can be used as effective invisible ink.
In June 1915, Walter Kirk, Deputy Director of Military Intelligence G. H. Q. (France and Belgium), recorded in his diary that Mansfield Cumming, the first director of SIS (now the British Foreign Office Intelligence Service), “investigated the existence of “invisible ink” at the University of London.”
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At that time, the technique of invisible writing was reduced to the use of cauliflower, as well as lemon juice and vinegar. These methods had their drawbacks, and in war conditions it was not always convenient to have such products on hand.
Frank Stagg, an employee close to Mansfield, said he would never forget his boss”s enthusiastic reaction to the deputy chief censor”s words. “Sperm do not react to iodine vapor!
We thought we had solved the main problem, says Frank Stagg.
In the future, this method was abandoned when it became clear that the odors that appeared over time gave away a secret plan. In addition, all this raised questions about the tendency of secret agents to masturbate.
