Macrakis, Kristie. <br/><br/>
Prisoners, lovers, and spies :  the story of invisible ink from Herodotus to al-Qaeda / 
Kristie Macrakis. 
 - 1 online resource (392 pages) 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>9780300188257 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Writing, Invisible--History.<br/>Invisible inks--History.<br/>Confidential communications--History.<br/>Espionage--Equipment and supplies--History.
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Electronic books.
<br/><br/><label>LC Class. No.: </label>Z104.5  / .M33 2014 
<br/><br/><label>Dewey Class. No.: </label>652