Unlocking History Concept uri

https://letterlocking.org/doll/concept/203


Preferred label

invisible ink  


Alternative label


Scope note

A kind of ink which cannot be seen after writing, but is revealed by heat or chemicals. 


Top concept

materials  

https://letterlocking.org/doll/concept/606  


Broader/Parent concept

ink       

https://letterlocking.org/doll/concept/195        


Related concept   

steganography        

https://letterlocking.org/doll/concept/521         


The Arts & Architecture ThesaurusⓇ Online, The Getty Research Institute Concept uri

http://vocab.getty.edu/page/aat/300015024


The Language of Bindings Thesaurus (LoB) Concept uri

Not in LoB


Scope note source reference


Source

Jana Dambrogio and Daniel Starza Smith with the Unlocking History Research Group. Letterlocking: The Hidden History of the Letter. Cambridge and London: MIT Press, 2025.


Nadine Akkerman and Pete Langman. Spycraft: tricks and tools of the dangerous trade from Elizabeth I to the restoration. 2024. New Haven: Yale University Press.


Nadine Akkerman. Invisible Agents: Women and Espionage in Seventeenth-Century Britain. 2018. Oxford University Press.


Giambattista della Porta's "Magiae Naturalis" (1558; 1644 ed. Book 16–Chapter IV) and Thomas Lupton’s “A Thousand Notable Things” (1579) gives a step-by-step description of how to secretly hide letters in eggs. View Porta's 1644 Latin edition of "Magia Naturalis" in MIT Libraries Institute Archives, Vail Collection, call number: Q155.P78 1644.



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