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British Intelligence Agency Used Semen as Invisible Ink

Illustration for article titled British Intelligence Agency Used Semen as Invisible Ink

A new book reveals that a member of MI6, the British spy agency, discovered during WWI that semen makes excellent invisible ink, and often deployed it in the field. The name of the man who discovered this? Mansfield Cumming.

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kaisermachead
kaisermachead

Blue dress? Never heard of it! Bahahahahaha