The CIA is finally giving up the secret ink goods.  And its only been since 1917 they've held it close to the vest.  All that's left is the recipe to Coca-Cola.

Who amongst us hasn't toyed with secret ink at some point during adolescence?  The CIA has been holding onto the formulas for their secret ink since 1917 and 1918.  They started to release the secret documents in 1976 but decided the information was still too sensitive.

The declassified material is believed to be the last remaining secrets from World War I.

If you cook up any of this I'd love to hear how it works!