This is why World War I-era British spies used semen as invisible ink | We Are The Mighty

This takes information protection, privacy, and sacrifice for the country to a whole new level — and every letter a love letter. Spies have a hand in everything. LOL what is in a name? 😲

The head of MI6, Captain Sir Mansfield Cumming, demanded that those using this method keep it fresh, because older letters started to smell terrible.

Source: This is why World War I-era British spies used semen as invisible ink | We Are The Mighty

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Author: Sam Sarmad

https://samsarmad.wordpress.com/about/