CIA Declassifies Documents for Secret Ink Recipes

Posted by admin on Apr 20, 2011

The Central Intelligence Agency on Tuesday declassified six World War I-era documents — the oldest classified documents held by the spy agency — containing the ingredients used to create invisible ink.

The formulas, which date from 1917 and 1918 and were the CIA’s oldest classified documents, were apparently so sensitive that as late as 1976 the agency decided against releasing the information.

Source & Full Story

Log in to leave a comment. Sign In / Sign Up