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British spies formerly used human semen as invisible ink; the practice fell from favor due to the manifestation of a foul odor when fresh semen was not used and due to mockery directed at the technology’s inventor.

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British spies formerly used human semen as invisible ink; the practice fell from favor due to the manifestation of a foul odor when fresh semen was not used and due to mockery directed at the technology’s inventor.

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