According to the
AP, the CIA declassified a WWI document that tells us of the
techniques used by spies, generals and diplomats to send secret messages in a diplomatic war that raged long after the guns stopped. The records reveal how invisible ink was used to send word between allies, and spies learned to open letters to read each others' secrets without leaving a trace.
There's even a document written in French of the German's secret ink formula, showing the French had cracked the enemy's code.
Why did "[t]hese documents remained classified for nearly a century"? Because .
[r]ecent advances in the chemistry of secret ink, and the lighting methods used to detect it have made the secrets revealed Tuesday obsolete, explained CIA spokesperson Marie E. Harf.
Seriously?
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