Prisoners, lovers, & spies : the story of invisible ink from Herodotus to al-Qaeda /
Macrakis, Kristie,author.
Includes bibliographical references and index.
The art of love and war -- Intrigue and inquisition -- Confessing secrets -- Invisible landscapes -- Revolutionary ink -- Magic -- The secret-ink war -- The United States enters the secret-ink war -- Visible Nazis -- The mystery of the microdot -- Invisible spy catchers -- Out in the cold -- Hiding in porn sites.
Writing, Invisible
Invisible inks
Confidential communications
Espionage