The CIA Declassifies Invisible Ink
Friday, April 22, 2011
On Tuesday, the CIA declassified the government's six oldest classified documents, dating from 1917 and 1918. According to the agency’s press release, "These documents, which describe secret writing techniques and are housed at the National Archives, are believed to be the only remaining classified documents from the World War I era." Spencer Ackerman, senior reporter for Wired.com’s national security blog, Danger Room, explains why the CIA was protecting its invisible ink recipes.