Secret documents made public

World War One era documents have been declassified by the CIA. One document outlines the chemicals and techniques necessary for developing certain types of secret writing ink and a method for opening sealed letters without detection. One question that has come up since the declassification is, why now as opposed to a decade ago when, the case was litigated in court? The revelation at the time was deemed to be a hazard to U.S. national security.

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