CIA: Learn how to make invisible ink, photos – from 1918
The CIA unearths some pretty interesting materials and this week it was touting the oldest once-classified documents in is collection. The mostly cryptic documents, from 1917 and 1918 describe secret writing techniques are believed to be the only remaining classified documents from the World War I era. Any documents describing secret writing fall under the CIA’s purview to declassify, the agency noted. +More on Network World: The hot art in the CIA’s cool art collection+ The CIA website noted that one file outlines the chemicals and techniques necessary for developing certain types of secret writing ink and a method for opening sealed letters without detection. Another communication dated June 14, 1918 – written in French – discloses the formula the German’s used to produce invisible ink.To read this article in full or to leave a comment, please click here